· 10 years ago · Sep 21, 2016, 05:22 PM
1<?php
2/**
3 * WordPress DB Class
4 *
5 * Original code from {@link http://php.justinvincent.com Justin Vincent (justin@visunet.ie)}
6 *
7 * @package WordPress
8 * @subpackage Database
9 * @since 0.71
10 */
11
12/**
13 * @since 0.71
14 */
15define( 'EZSQL_VERSION', 'WP1.25' );
16
17/**
18 * @since 0.71
19 */
20define( 'OBJECT', 'OBJECT' );
21define( 'object', 'OBJECT' ); // Back compat.
22
23/**
24 * @since 2.5.0
25 */
26define( 'OBJECT_K', 'OBJECT_K' );
27
28/**
29 * @since 0.71
30 */
31define( 'ARRAY_A', 'ARRAY_A' );
32
33/**
34 * @since 0.71
35 */
36define( 'ARRAY_N', 'ARRAY_N' );
37
38/**
39 * WordPress Database Access Abstraction Object
40 *
41 * It is possible to replace this class with your own
42 * by setting the $wpdb global variable in wp-content/db.php
43 * file to your class. The wpdb class will still be included,
44 * so you can extend it or simply use your own.
45 *
46 * @link https://codex.wordpress.org/Function_Reference/wpdb_Class
47 *
48 * @package WordPress
49 * @subpackage Database
50 * @since 0.71
51 */
52class wpdb {
53
54 /**
55 * Whether to show SQL/DB errors.
56 *
57 * Default behavior is to show errors if both WP_DEBUG and WP_DEBUG_DISPLAY
58 * evaluated to true.
59 *
60 * @since 0.71
61 * @access private
62 * @var bool
63 */
64 var $show_errors = false;
65
66 /**
67 * Whether to suppress errors during the DB bootstrapping.
68 *
69 * @access private
70 * @since 2.5.0
71 * @var bool
72 */
73 var $suppress_errors = false;
74
75 /**
76 * The last error during query.
77 *
78 * @since 2.5.0
79 * @var string
80 */
81 public $last_error = '';
82
83 /**
84 * Amount of queries made
85 *
86 * @since 1.2.0
87 * @access public
88 * @var int
89 */
90 public $num_queries = 0;
91
92 /**
93 * Count of rows returned by previous query
94 *
95 * @since 0.71
96 * @access public
97 * @var int
98 */
99 public $num_rows = 0;
100
101 /**
102 * Count of affected rows by previous query
103 *
104 * @since 0.71
105 * @access private
106 * @var int
107 */
108 var $rows_affected = 0;
109
110 /**
111 * The ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT).
112 *
113 * @since 0.71
114 * @access public
115 * @var int
116 */
117 public $insert_id = 0;
118
119 /**
120 * Last query made
121 *
122 * @since 0.71
123 * @access private
124 * @var array
125 */
126 var $last_query;
127
128 /**
129 * Results of the last query made
130 *
131 * @since 0.71
132 * @access private
133 * @var array|null
134 */
135 var $last_result;
136
137 /**
138 * MySQL result, which is either a resource or boolean.
139 *
140 * @since 0.71
141 * @access protected
142 * @var mixed
143 */
144 protected $result;
145
146 /**
147 * Cached column info, for sanity checking data before inserting
148 *
149 * @since 4.2.0
150 * @access protected
151 * @var array
152 */
153 protected $col_meta = array();
154
155 /**
156 * Calculated character sets on tables
157 *
158 * @since 4.2.0
159 * @access protected
160 * @var array
161 */
162 protected $table_charset = array();
163
164 /**
165 * Whether text fields in the current query need to be sanity checked.
166 *
167 * @since 4.2.0
168 * @access protected
169 * @var bool
170 */
171 protected $check_current_query = true;
172
173 /**
174 * Flag to ensure we don't run into recursion problems when checking the collation.
175 *
176 * @since 4.2.0
177 * @access private
178 * @see wpdb::check_safe_collation()
179 * @var bool
180 */
181 private $checking_collation = false;
182
183 /**
184 * Saved info on the table column
185 *
186 * @since 0.71
187 * @access protected
188 * @var array
189 */
190 protected $col_info;
191
192 /**
193 * Saved queries that were executed
194 *
195 * @since 1.5.0
196 * @access private
197 * @var array
198 */
199 var $queries;
200
201 /**
202 * The number of times to retry reconnecting before dying.
203 *
204 * @since 3.9.0
205 * @access protected
206 * @see wpdb::check_connection()
207 * @var int
208 */
209 protected $reconnect_retries = 5;
210
211 /**
212 * WordPress table prefix
213 *
214 * You can set this to have multiple WordPress installations
215 * in a single database. The second reason is for possible
216 * security precautions.
217 *
218 * @since 2.5.0
219 * @access public
220 * @var string
221 */
222 public $prefix = '';
223
224 /**
225 * WordPress base table prefix.
226 *
227 * @since 3.0.0
228 * @access public
229 * @var string
230 */
231 public $base_prefix;
232
233 /**
234 * Whether the database queries are ready to start executing.
235 *
236 * @since 2.3.2
237 * @access private
238 * @var bool
239 */
240 var $ready = false;
241
242 /**
243 * Blog ID.
244 *
245 * @since 3.0.0
246 * @access public
247 * @var int
248 */
249 public $blogid = 0;
250
251 /**
252 * Site ID.
253 *
254 * @since 3.0.0
255 * @access public
256 * @var int
257 */
258 public $siteid = 0;
259
260 /**
261 * List of WordPress per-blog tables
262 *
263 * @since 2.5.0
264 * @access private
265 * @see wpdb::tables()
266 * @var array
267 */
268 var $tables = array( 'posts', 'comments', 'links', 'options', 'postmeta',
269 'terms', 'term_taxonomy', 'term_relationships', 'termmeta', 'commentmeta' );
270
271 /**
272 * List of deprecated WordPress tables
273 *
274 * categories, post2cat, and link2cat were deprecated in 2.3.0, db version 5539
275 *
276 * @since 2.9.0
277 * @access private
278 * @see wpdb::tables()
279 * @var array
280 */
281 var $old_tables = array( 'categories', 'post2cat', 'link2cat' );
282
283 /**
284 * List of WordPress global tables
285 *
286 * @since 3.0.0
287 * @access private
288 * @see wpdb::tables()
289 * @var array
290 */
291 var $global_tables = array( 'users', 'usermeta' );
292
293 /**
294 * List of Multisite global tables
295 *
296 * @since 3.0.0
297 * @access private
298 * @see wpdb::tables()
299 * @var array
300 */
301 var $ms_global_tables = array( 'blogs', 'signups', 'site', 'sitemeta',
302 'sitecategories', 'registration_log', 'blog_versions' );
303
304 /**
305 * WordPress Comments table
306 *
307 * @since 1.5.0
308 * @access public
309 * @var string
310 */
311 public $comments;
312
313 /**
314 * WordPress Comment Metadata table
315 *
316 * @since 2.9.0
317 * @access public
318 * @var string
319 */
320 public $commentmeta;
321
322 /**
323 * WordPress Links table
324 *
325 * @since 1.5.0
326 * @access public
327 * @var string
328 */
329 public $links;
330
331 /**
332 * WordPress Options table
333 *
334 * @since 1.5.0
335 * @access public
336 * @var string
337 */
338 public $options;
339
340 /**
341 * WordPress Post Metadata table
342 *
343 * @since 1.5.0
344 * @access public
345 * @var string
346 */
347 public $postmeta;
348
349 /**
350 * WordPress Posts table
351 *
352 * @since 1.5.0
353 * @access public
354 * @var string
355 */
356 public $posts;
357
358 /**
359 * WordPress Terms table
360 *
361 * @since 2.3.0
362 * @access public
363 * @var string
364 */
365 public $terms;
366
367 /**
368 * WordPress Term Relationships table
369 *
370 * @since 2.3.0
371 * @access public
372 * @var string
373 */
374 public $term_relationships;
375
376 /**
377 * WordPress Term Taxonomy table
378 *
379 * @since 2.3.0
380 * @access public
381 * @var string
382 */
383 public $term_taxonomy;
384
385 /**
386 * WordPress Term Meta table.
387 *
388 * @since 4.4.0
389 * @access public
390 * @var string
391 */
392 public $termmeta;
393
394 //
395 // Global and Multisite tables
396 //
397
398 /**
399 * WordPress User Metadata table
400 *
401 * @since 2.3.0
402 * @access public
403 * @var string
404 */
405 public $usermeta;
406
407 /**
408 * WordPress Users table
409 *
410 * @since 1.5.0
411 * @access public
412 * @var string
413 */
414 public $users;
415
416 /**
417 * Multisite Blogs table
418 *
419 * @since 3.0.0
420 * @access public
421 * @var string
422 */
423 public $blogs;
424
425 /**
426 * Multisite Blog Versions table
427 *
428 * @since 3.0.0
429 * @access public
430 * @var string
431 */
432 public $blog_versions;
433
434 /**
435 * Multisite Registration Log table
436 *
437 * @since 3.0.0
438 * @access public
439 * @var string
440 */
441 public $registration_log;
442
443 /**
444 * Multisite Signups table
445 *
446 * @since 3.0.0
447 * @access public
448 * @var string
449 */
450 public $signups;
451
452 /**
453 * Multisite Sites table
454 *
455 * @since 3.0.0
456 * @access public
457 * @var string
458 */
459 public $site;
460
461 /**
462 * Multisite Sitewide Terms table
463 *
464 * @since 3.0.0
465 * @access public
466 * @var string
467 */
468 public $sitecategories;
469
470 /**
471 * Multisite Site Metadata table
472 *
473 * @since 3.0.0
474 * @access public
475 * @var string
476 */
477 public $sitemeta;
478
479 /**
480 * Format specifiers for DB columns. Columns not listed here default to %s. Initialized during WP load.
481 *
482 * Keys are column names, values are format types: 'ID' => '%d'
483 *
484 * @since 2.8.0
485 * @see wpdb::prepare()
486 * @see wpdb::insert()
487 * @see wpdb::update()
488 * @see wpdb::delete()
489 * @see wp_set_wpdb_vars()
490 * @access public
491 * @var array
492 */
493 public $field_types = array();
494
495 /**
496 * Database table columns charset
497 *
498 * @since 2.2.0
499 * @access public
500 * @var string
501 */
502 public $charset;
503
504 /**
505 * Database table columns collate
506 *
507 * @since 2.2.0
508 * @access public
509 * @var string
510 */
511 public $collate;
512
513 /**
514 * Database Username
515 *
516 * @since 2.9.0
517 * @access protected
518 * @var string
519 */
520 protected $dbuser;
521
522 /**
523 * Database Password
524 *
525 * @since 3.1.0
526 * @access protected
527 * @var string
528 */
529 protected $dbpassword;
530
531 /**
532 * Database Name
533 *
534 * @since 3.1.0
535 * @access protected
536 * @var string
537 */
538 protected $dbname;
539
540 /**
541 * Database Host
542 *
543 * @since 3.1.0
544 * @access protected
545 * @var string
546 */
547 protected $dbhost;
548
549 /**
550 * Database Handle
551 *
552 * @since 0.71
553 * @access protected
554 * @var string
555 */
556 protected $dbh;
557
558 /**
559 * A textual description of the last query/get_row/get_var call
560 *
561 * @since 3.0.0
562 * @access public
563 * @var string
564 */
565 public $func_call;
566
567 /**
568 * Whether MySQL is used as the database engine.
569 *
570 * Set in WPDB::db_connect() to true, by default. This is used when checking
571 * against the required MySQL version for WordPress. Normally, a replacement
572 * database drop-in (db.php) will skip these checks, but setting this to true
573 * will force the checks to occur.
574 *
575 * @since 3.3.0
576 * @access public
577 * @var bool
578 */
579 public $is_mysql = null;
580
581 /**
582 * A list of incompatible SQL modes.
583 *
584 * @since 3.9.0
585 * @access protected
586 * @var array
587 */
588 protected $incompatible_modes = array( 'NO_ZERO_DATE', 'ONLY_FULL_GROUP_BY',
589 'STRICT_TRANS_TABLES', 'STRICT_ALL_TABLES', 'TRADITIONAL' );
590
591 /**
592 * Whether to use mysqli over mysql.
593 *
594 * @since 3.9.0
595 * @access private
596 * @var bool
597 */
598 private $use_mysqli = false;
599
600 /**
601 * Whether we've managed to successfully connect at some point
602 *
603 * @since 3.9.0
604 * @access private
605 * @var bool
606 */
607 private $has_connected = false;
608
609 /**
610 * Connects to the database server and selects a database
611 *
612 * PHP5 style constructor for compatibility with PHP5. Does
613 * the actual setting up of the class properties and connection
614 * to the database.
615 *
616 * @link https://core.trac.wordpress.org/ticket/3354
617 * @since 2.0.8
618 *
619 * @global string $wp_version
620 *
621 * @param string $dbuser MySQL database user
622 * @param string $dbpassword MySQL database password
623 * @param string $dbname MySQL database name
624 * @param string $dbhost MySQL database host
625 */
626 public function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) {
627 register_shutdown_function( array( $this, '__destruct' ) );
628
629 if ( WP_DEBUG && WP_DEBUG_DISPLAY )
630 $this->show_errors();
631
632 /* Use ext/mysqli if it exists and:
633 * - WP_USE_EXT_MYSQL is defined as false, or
634 * - We are a development version of WordPress, or
635 * - We are running PHP 5.5 or greater, or
636 * - ext/mysql is not loaded.
637 */
638 if ( function_exists( 'mysqli_connect' ) ) {
639 if ( defined( 'WP_USE_EXT_MYSQL' ) ) {
640 $this->use_mysqli = ! WP_USE_EXT_MYSQL;
641 } elseif ( version_compare( phpversion(), '5.5', '>=' ) || ! function_exists( 'mysql_connect' ) ) {
642 $this->use_mysqli = true;
643 } elseif ( false !== strpos( $GLOBALS['wp_version'], '-' ) ) {
644 $this->use_mysqli = true;
645 }
646 }
647
648 $this->dbuser = $dbuser;
649 $this->dbpassword = $dbpassword;
650 $this->dbname = $dbname;
651 $this->dbhost = $dbhost;
652
653 // wp-config.php creation will manually connect when ready.
654 if ( defined( 'WP_SETUP_CONFIG' ) ) {
655 return;
656 }
657
658 $this->db_connect();
659 }
660
661 /**
662 * PHP5 style destructor and will run when database object is destroyed.
663 *
664 * @see wpdb::__construct()
665 * @since 2.0.8
666 * @return true
667 */
668 public function __destruct() {
669 return true;
670 }
671
672 /**
673 * Makes private properties readable for backward compatibility.
674 *
675 * @since 3.5.0
676 *
677 * @param string $name The private member to get, and optionally process
678 * @return mixed The private member
679 */
680 public function __get( $name ) {
681 if ( 'col_info' === $name )
682 $this->load_col_info();
683
684 return $this->$name;
685 }
686
687 /**
688 * Makes private properties settable for backward compatibility.
689 *
690 * @since 3.5.0
691 *
692 * @param string $name The private member to set
693 * @param mixed $value The value to set
694 */
695 public function __set( $name, $value ) {
696 $protected_members = array(
697 'col_meta',
698 'table_charset',
699 'check_current_query',
700 );
701 if ( in_array( $name, $protected_members, true ) ) {
702 return;
703 }
704 $this->$name = $value;
705 }
706
707 /**
708 * Makes private properties check-able for backward compatibility.
709 *
710 * @since 3.5.0
711 *
712 * @param string $name The private member to check
713 *
714 * @return bool If the member is set or not
715 */
716 public function __isset( $name ) {
717 return isset( $this->$name );
718 }
719
720 /**
721 * Makes private properties un-settable for backward compatibility.
722 *
723 * @since 3.5.0
724 *
725 * @param string $name The private member to unset
726 */
727 public function __unset( $name ) {
728 unset( $this->$name );
729 }
730
731 /**
732 * Set $this->charset and $this->collate
733 *
734 * @since 3.1.0
735 */
736 public function init_charset() {
737 if ( function_exists('is_multisite') && is_multisite() ) {
738 $charset = 'utf8';
739 if ( defined( 'DB_COLLATE' ) && DB_COLLATE ) {
740 $collate = DB_COLLATE;
741 } else {
742 $collate = 'utf8_general_ci';
743 }
744 } elseif ( defined( 'DB_COLLATE' ) ) {
745 $collate = DB_COLLATE;
746 }
747
748 if ( defined( 'DB_CHARSET' ) ) {
749 $charset = DB_CHARSET;
750 }
751
752 $charset_collate = $this->determine_charset( $charset, $collate );
753
754 $this->charset = $charset_collate['charset'];
755 $this->collate = $charset_collate['collate'];
756 }
757
758 /**
759 * Determines the best charset and collation to use given a charset and collation.
760 *
761 * For example, when able, utf8mb4 should be used instead of utf8.
762 *
763 * @since 4.6.0
764 * @access public
765 *
766 * @param string $charset The character set to check.
767 * @param string $collate The collation to check.
768 * @return array The most appropriate character set and collation to use.
769 */
770 public function determine_charset( $charset, $collate ) {
771 if ( ( $this->use_mysqli && ! ( $this->dbh instanceof mysqli ) ) || empty( $this->dbh ) ) {
772 return compact( 'charset', 'collate' );
773 }
774
775 if ( 'utf8' === $charset && $this->has_cap( 'utf8mb4' ) ) {
776 $charset = 'utf8mb4';
777 }
778
779 if ( 'utf8mb4' === $charset ) {
780 // _general_ is outdated, so we can upgrade it to _unicode_, instead.
781 if ( ! $collate || 'utf8_general_ci' === $collate ) {
782 $collate = 'utf8mb4_unicode_ci';
783 } else {
784 $collate = str_replace( 'utf8_', 'utf8mb4_', $collate );
785 }
786 }
787
788 // _unicode_520_ is a better collation, we should use that when it's available.
789 if ( $this->has_cap( 'utf8mb4_520' ) && 'utf8mb4_unicode_ci' === $collate ) {
790 $collate = 'utf8mb4_unicode_520_ci';
791 }
792
793 return compact( 'charset', 'collate' );
794 }
795
796 /**
797 * Sets the connection's character set.
798 *
799 * @since 3.1.0
800 *
801 * @param resource $dbh The resource given by mysql_connect
802 * @param string $charset Optional. The character set. Default null.
803 * @param string $collate Optional. The collation. Default null.
804 */
805 public function set_charset( $dbh, $charset = null, $collate = null ) {
806 if ( ! isset( $charset ) )
807 $charset = $this->charset;
808 if ( ! isset( $collate ) )
809 $collate = $this->collate;
810 if ( $this->has_cap( 'collation' ) && ! empty( $charset ) ) {
811 if ( $this->use_mysqli ) {
812 if ( function_exists( 'mysqli_set_charset' ) && $this->has_cap( 'set_charset' ) ) {
813 mysqli_set_charset( $dbh, $charset );
814 }
815 $query = $this->prepare( 'SET NAMES %s', $charset );
816 if ( ! empty( $collate ) )
817 $query .= $this->prepare( ' COLLATE %s', $collate );
818 mysqli_query( $dbh, $query );
819 } else {
820 if ( function_exists( 'mysql_set_charset' ) && $this->has_cap( 'set_charset' ) ) {
821 mysql_set_charset( $charset, $dbh );
822 }
823 $query = $this->prepare( 'SET NAMES %s', $charset );
824 if ( ! empty( $collate ) )
825 $query .= $this->prepare( ' COLLATE %s', $collate );
826 mysql_query( $query, $dbh );
827 }
828 }
829 }
830
831 /**
832 * Change the current SQL mode, and ensure its WordPress compatibility.
833 *
834 * If no modes are passed, it will ensure the current MySQL server
835 * modes are compatible.
836 *
837 * @since 3.9.0
838 *
839 * @param array $modes Optional. A list of SQL modes to set.
840 */
841 public function set_sql_mode( $modes = array() ) {
842 if ( empty( $modes ) ) {
843 if ( $this->use_mysqli ) {
844 $res = mysqli_query( $this->dbh, 'SELECT @@SESSION.sql_mode' );
845 } else {
846 $res = mysql_query( 'SELECT @@SESSION.sql_mode', $this->dbh );
847 }
848
849 if ( empty( $res ) ) {
850 return;
851 }
852
853 if ( $this->use_mysqli ) {
854 $modes_array = mysqli_fetch_array( $res );
855 if ( empty( $modes_array[0] ) ) {
856 return;
857 }
858 $modes_str = $modes_array[0];
859 } else {
860 $modes_str = mysql_result( $res, 0 );
861 }
862
863 if ( empty( $modes_str ) ) {
864 return;
865 }
866
867 $modes = explode( ',', $modes_str );
868 }
869
870 $modes = array_change_key_case( $modes, CASE_UPPER );
871
872 /**
873 * Filters the list of incompatible SQL modes to exclude.
874 *
875 * @since 3.9.0
876 *
877 * @param array $incompatible_modes An array of incompatible modes.
878 */
879 $incompatible_modes = (array) apply_filters( 'incompatible_sql_modes', $this->incompatible_modes );
880
881 foreach ( $modes as $i => $mode ) {
882 if ( in_array( $mode, $incompatible_modes ) ) {
883 unset( $modes[ $i ] );
884 }
885 }
886
887 $modes_str = implode( ',', $modes );
888
889 if ( $this->use_mysqli ) {
890 mysqli_query( $this->dbh, "SET SESSION sql_mode='$modes_str'" );
891 } else {
892 mysql_query( "SET SESSION sql_mode='$modes_str'", $this->dbh );
893 }
894 }
895
896 /**
897 * Sets the table prefix for the WordPress tables.
898 *
899 * @since 2.5.0
900 *
901 * @param string $prefix Alphanumeric name for the new prefix.
902 * @param bool $set_table_names Optional. Whether the table names, e.g. wpdb::$posts, should be updated or not.
903 * @return string|WP_Error Old prefix or WP_Error on error
904 */
905 public function set_prefix( $prefix, $set_table_names = true ) {
906
907 if ( preg_match( '|[^a-z0-9_]|i', $prefix ) )
908 return new WP_Error('invalid_db_prefix', 'Invalid database prefix' );
909
910 $old_prefix = is_multisite() ? '' : $prefix;
911
912 if ( isset( $this->base_prefix ) )
913 $old_prefix = $this->base_prefix;
914
915 $this->base_prefix = $prefix;
916
917 if ( $set_table_names ) {
918 foreach ( $this->tables( 'global' ) as $table => $prefixed_table )
919 $this->$table = $prefixed_table;
920
921 if ( is_multisite() && empty( $this->blogid ) )
922 return $old_prefix;
923
924 $this->prefix = $this->get_blog_prefix();
925
926 foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )
927 $this->$table = $prefixed_table;
928
929 foreach ( $this->tables( 'old' ) as $table => $prefixed_table )
930 $this->$table = $prefixed_table;
931 }
932 return $old_prefix;
933 }
934
935 /**
936 * Sets blog id.
937 *
938 * @since 3.0.0
939 * @access public
940 *
941 * @param int $blog_id
942 * @param int $site_id Optional.
943 * @return int previous blog id
944 */
945 public function set_blog_id( $blog_id, $site_id = 0 ) {
946 if ( ! empty( $site_id ) )
947 $this->siteid = $site_id;
948
949 $old_blog_id = $this->blogid;
950 $this->blogid = $blog_id;
951
952 $this->prefix = $this->get_blog_prefix();
953
954 foreach ( $this->tables( 'blog' ) as $table => $prefixed_table )
955 $this->$table = $prefixed_table;
956
957 foreach ( $this->tables( 'old' ) as $table => $prefixed_table )
958 $this->$table = $prefixed_table;
959
960 return $old_blog_id;
961 }
962
963 /**
964 * Gets blog prefix.
965 *
966 * @since 3.0.0
967 * @param int $blog_id Optional.
968 * @return string Blog prefix.
969 */
970 public function get_blog_prefix( $blog_id = null ) {
971 if ( is_multisite() ) {
972 if ( null === $blog_id )
973 $blog_id = $this->blogid;
974 $blog_id = (int) $blog_id;
975 if ( defined( 'MULTISITE' ) && ( 0 == $blog_id || 1 == $blog_id ) )
976 return $this->base_prefix;
977 else
978 return $this->base_prefix . $blog_id . '_';
979 } else {
980 return $this->base_prefix;
981 }
982 }
983
984 /**
985 * Returns an array of WordPress tables.
986 *
987 * Also allows for the CUSTOM_USER_TABLE and CUSTOM_USER_META_TABLE to
988 * override the WordPress users and usermeta tables that would otherwise
989 * be determined by the prefix.
990 *
991 * The scope argument can take one of the following:
992 *
993 * 'all' - returns 'all' and 'global' tables. No old tables are returned.
994 * 'blog' - returns the blog-level tables for the queried blog.
995 * 'global' - returns the global tables for the installation, returning multisite tables only if running multisite.
996 * 'ms_global' - returns the multisite global tables, regardless if current installation is multisite.
997 * 'old' - returns tables which are deprecated.
998 *
999 * @since 3.0.0
1000 * @uses wpdb::$tables
1001 * @uses wpdb::$old_tables
1002 * @uses wpdb::$global_tables
1003 * @uses wpdb::$ms_global_tables
1004 *
1005 * @param string $scope Optional. Can be all, global, ms_global, blog, or old tables. Defaults to all.
1006 * @param bool $prefix Optional. Whether to include table prefixes. Default true. If blog
1007 * prefix is requested, then the custom users and usermeta tables will be mapped.
1008 * @param int $blog_id Optional. The blog_id to prefix. Defaults to wpdb::$blogid. Used only when prefix is requested.
1009 * @return array Table names. When a prefix is requested, the key is the unprefixed table name.
1010 */
1011 public function tables( $scope = 'all', $prefix = true, $blog_id = 0 ) {
1012 switch ( $scope ) {
1013 case 'all' :
1014 $tables = array_merge( $this->global_tables, $this->tables );
1015 if ( is_multisite() )
1016 $tables = array_merge( $tables, $this->ms_global_tables );
1017 break;
1018 case 'blog' :
1019 $tables = $this->tables;
1020 break;
1021 case 'global' :
1022 $tables = $this->global_tables;
1023 if ( is_multisite() )
1024 $tables = array_merge( $tables, $this->ms_global_tables );
1025 break;
1026 case 'ms_global' :
1027 $tables = $this->ms_global_tables;
1028 break;
1029 case 'old' :
1030 $tables = $this->old_tables;
1031 break;
1032 default :
1033 return array();
1034 }
1035
1036 if ( $prefix ) {
1037 if ( ! $blog_id )
1038 $blog_id = $this->blogid;
1039 $blog_prefix = $this->get_blog_prefix( $blog_id );
1040 $base_prefix = $this->base_prefix;
1041 $global_tables = array_merge( $this->global_tables, $this->ms_global_tables );
1042 foreach ( $tables as $k => $table ) {
1043 if ( in_array( $table, $global_tables ) )
1044 $tables[ $table ] = $base_prefix . $table;
1045 else
1046 $tables[ $table ] = $blog_prefix . $table;
1047 unset( $tables[ $k ] );
1048 }
1049
1050 if ( isset( $tables['users'] ) && defined( 'CUSTOM_USER_TABLE' ) )
1051 $tables['users'] = CUSTOM_USER_TABLE;
1052
1053 if ( isset( $tables['usermeta'] ) && defined( 'CUSTOM_USER_META_TABLE' ) )
1054 $tables['usermeta'] = CUSTOM_USER_META_TABLE;
1055 }
1056
1057 return $tables;
1058 }
1059
1060 /**
1061 * Selects a database using the current database connection.
1062 *
1063 * The database name will be changed based on the current database
1064 * connection. On failure, the execution will bail and display an DB error.
1065 *
1066 * @since 0.71
1067 *
1068 * @param string $db MySQL database name
1069 * @param resource|null $dbh Optional link identifier.
1070 */
1071 public function select( $db, $dbh = null ) {
1072 if ( is_null($dbh) )
1073 $dbh = $this->dbh;
1074
1075 if ( $this->use_mysqli ) {
1076 $success = mysqli_select_db( $dbh, $db );
1077 } else {
1078 $success = mysql_select_db( $db, $dbh );
1079 }
1080 if ( ! $success ) {
1081 $this->ready = false;
1082 if ( ! did_action( 'template_redirect' ) ) {
1083 wp_load_translations_early();
1084
1085 $message = '<h1>' . __( 'Can’t select database' ) . "</h1>\n";
1086
1087 $message .= '<p>' . sprintf(
1088 /* translators: %s: database name */
1089 __( 'We were able to connect to the database server (which means your username and password is okay) but not able to select the %s database.' ),
1090 '<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>'
1091 ) . "</p>\n";
1092
1093 $message .= "<ul>\n";
1094 $message .= '<li>' . __( 'Are you sure it exists?' ) . "</li>\n";
1095
1096 $message .= '<li>' . sprintf(
1097 /* translators: 1: database user, 2: database name */
1098 __( 'Does the user %1$s have permission to use the %2$s database?' ),
1099 '<code>' . htmlspecialchars( $this->dbuser, ENT_QUOTES ) . '</code>',
1100 '<code>' . htmlspecialchars( $db, ENT_QUOTES ) . '</code>'
1101 ) . "</li>\n";
1102
1103 $message .= '<li>' . sprintf(
1104 /* translators: %s: database name */
1105 __( 'On some systems the name of your database is prefixed with your username, so it would be like <code>username_%1$s</code>. Could that be the problem?' ),
1106 htmlspecialchars( $db, ENT_QUOTES )
1107 ). "</li>\n";
1108
1109 $message .= "</ul>\n";
1110
1111 $message .= '<p>' . sprintf(
1112 /* translators: %s: support forums URL */
1113 __( 'If you don’t know how to set up a database you should <strong>contact your host</strong>. If all else fails you may find help at the <a href="%s">WordPress Support Forums</a>.' ),
1114 __( 'https://wordpress.org/support/' )
1115 ) . "</p>\n";
1116
1117 $this->bail( $message, 'db_select_fail' );
1118 }
1119 }
1120 }
1121
1122 /**
1123 * Do not use, deprecated.
1124 *
1125 * Use esc_sql() or wpdb::prepare() instead.
1126 *
1127 * @since 2.8.0
1128 * @deprecated 3.6.0 Use wpdb::prepare()
1129 * @see wpdb::prepare
1130 * @see esc_sql()
1131 * @access private
1132 *
1133 * @param string $string
1134 * @return string
1135 */
1136 function _weak_escape( $string ) {
1137 if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) )
1138 _deprecated_function( __METHOD__, '3.6.0', 'wpdb::prepare() or esc_sql()' );
1139 return addslashes( $string );
1140 }
1141
1142 /**
1143 * Real escape, using mysqli_real_escape_string() or mysql_real_escape_string()
1144 *
1145 * @see mysqli_real_escape_string()
1146 * @see mysql_real_escape_string()
1147 * @since 2.8.0
1148 * @access private
1149 *
1150 * @param string $string to escape
1151 * @return string escaped
1152 */
1153 function _real_escape( $string ) {
1154 if ( $this->dbh ) {
1155 if ( $this->use_mysqli ) {
1156 return mysqli_real_escape_string( $this->dbh, $string );
1157 } else {
1158 return mysql_real_escape_string( $string, $this->dbh );
1159 }
1160 }
1161
1162 $class = get_class( $this );
1163 if ( function_exists( '__' ) ) {
1164 /* translators: %s: database access abstraction class, usually wpdb or a class extending wpdb */
1165 _doing_it_wrong( $class, sprintf( __( '%s must set a database connection for use with escaping.' ), $class ), '3.6.0' );
1166 } else {
1167 _doing_it_wrong( $class, sprintf( '%s must set a database connection for use with escaping.', $class ), '3.6.0' );
1168 }
1169 return addslashes( $string );
1170 }
1171
1172 /**
1173 * Escape data. Works on arrays.
1174 *
1175 * @uses wpdb::_real_escape()
1176 * @since 2.8.0
1177 * @access private
1178 *
1179 * @param string|array $data
1180 * @return string|array escaped
1181 */
1182 function _escape( $data ) {
1183 if ( is_array( $data ) ) {
1184 foreach ( $data as $k => $v ) {
1185 if ( is_array($v) )
1186 $data[$k] = $this->_escape( $v );
1187 else
1188 $data[$k] = $this->_real_escape( $v );
1189 }
1190 } else {
1191 $data = $this->_real_escape( $data );
1192 }
1193
1194 return $data;
1195 }
1196
1197 /**
1198 * Do not use, deprecated.
1199 *
1200 * Use esc_sql() or wpdb::prepare() instead.
1201 *
1202 * @since 0.71
1203 * @deprecated 3.6.0 Use wpdb::prepare()
1204 * @see wpdb::prepare()
1205 * @see esc_sql()
1206 *
1207 * @param mixed $data
1208 * @return mixed
1209 */
1210 public function escape( $data ) {
1211 if ( func_num_args() === 1 && function_exists( '_deprecated_function' ) )
1212 _deprecated_function( __METHOD__, '3.6.0', 'wpdb::prepare() or esc_sql()' );
1213 if ( is_array( $data ) ) {
1214 foreach ( $data as $k => $v ) {
1215 if ( is_array( $v ) )
1216 $data[$k] = $this->escape( $v, 'recursive' );
1217 else
1218 $data[$k] = $this->_weak_escape( $v, 'internal' );
1219 }
1220 } else {
1221 $data = $this->_weak_escape( $data, 'internal' );
1222 }
1223
1224 return $data;
1225 }
1226
1227 /**
1228 * Escapes content by reference for insertion into the database, for security
1229 *
1230 * @uses wpdb::_real_escape()
1231 *
1232 * @since 2.3.0
1233 *
1234 * @param string $string to escape
1235 */
1236 public function escape_by_ref( &$string ) {
1237 if ( ! is_float( $string ) )
1238 $string = $this->_real_escape( $string );
1239 }
1240
1241 /**
1242 * Prepares a SQL query for safe execution. Uses sprintf()-like syntax.
1243 *
1244 * The following directives can be used in the query format string:
1245 * %d (integer)
1246 * %f (float)
1247 * %s (string)
1248 * %% (literal percentage sign - no argument needed)
1249 *
1250 * All of %d, %f, and %s are to be left unquoted in the query string and they need an argument passed for them.
1251 * Literals (%) as parts of the query must be properly written as %%.
1252 *
1253 * This function only supports a small subset of the sprintf syntax; it only supports %d (integer), %f (float), and %s (string).
1254 * Does not support sign, padding, alignment, width or precision specifiers.
1255 * Does not support argument numbering/swapping.
1256 *
1257 * May be called like {@link https://secure.php.net/sprintf sprintf()} or like {@link https://secure.php.net/vsprintf vsprintf()}.
1258 *
1259 * Both %d and %s should be left unquoted in the query string.
1260 *
1261 * wpdb::prepare( "SELECT * FROM `table` WHERE `column` = %s AND `field` = %d", 'foo', 1337 )
1262 * wpdb::prepare( "SELECT DATE_FORMAT(`field`, '%%c') FROM `table` WHERE `column` = %s", 'foo' );
1263 *
1264 * @link https://secure.php.net/sprintf Description of syntax.
1265 * @since 2.3.0
1266 *
1267 * @param string $query Query statement with sprintf()-like placeholders
1268 * @param array|mixed $args The array of variables to substitute into the query's placeholders if being called like
1269 * {@link https://secure.php.net/vsprintf vsprintf()}, or the first variable to substitute into the query's placeholders if
1270 * being called like {@link https://secure.php.net/sprintf sprintf()}.
1271 * @param mixed $args,... further variables to substitute into the query's placeholders if being called like
1272 * {@link https://secure.php.net/sprintf sprintf()}.
1273 * @return string|void Sanitized query string, if there is a query to prepare.
1274 */
1275 public function prepare( $query, $args ) {
1276 if ( is_null( $query ) )
1277 return;
1278
1279 // This is not meant to be foolproof -- but it will catch obviously incorrect usage.
1280 if ( strpos( $query, '%' ) === false ) {
1281 _doing_it_wrong( 'wpdb::prepare', sprintf( __( 'The query argument of %s must have a placeholder.' ), 'wpdb::prepare()' ), '3.9.0' );
1282 }
1283
1284 $args = func_get_args();
1285 array_shift( $args );
1286 // If args were passed as an array (as in vsprintf), move them up
1287 if ( isset( $args[0] ) && is_array($args[0]) )
1288 $args = $args[0];
1289 $query = str_replace( "'%s'", '%s', $query ); // in case someone mistakenly already singlequoted it
1290 $query = str_replace( '"%s"', '%s', $query ); // doublequote unquoting
1291 $query = preg_replace( '|(?<!%)%f|' , '%F', $query ); // Force floats to be locale unaware
1292 $query = preg_replace( '|(?<!%)%s|', "'%s'", $query ); // quote the strings, avoiding escaped strings like %%s
1293 array_walk( $args, array( $this, 'escape_by_ref' ) );
1294 return @vsprintf( $query, $args );
1295 }
1296
1297 /**
1298 * First half of escaping for LIKE special characters % and _ before preparing for MySQL.
1299 *
1300 * Use this only before wpdb::prepare() or esc_sql(). Reversing the order is very bad for security.
1301 *
1302 * Example Prepared Statement:
1303 *
1304 * $wild = '%';
1305 * $find = 'only 43% of planets';
1306 * $like = $wild . $wpdb->esc_like( $find ) . $wild;
1307 * $sql = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_content LIKE '%s'", $like );
1308 *
1309 * Example Escape Chain:
1310 *
1311 * $sql = esc_sql( $wpdb->esc_like( $input ) );
1312 *
1313 * @since 4.0.0
1314 * @access public
1315 *
1316 * @param string $text The raw text to be escaped. The input typed by the user should have no
1317 * extra or deleted slashes.
1318 * @return string Text in the form of a LIKE phrase. The output is not SQL safe. Call $wpdb::prepare()
1319 * or real_escape next.
1320 */
1321 public function esc_like( $text ) {
1322 return addcslashes( $text, '_%\\' );
1323 }
1324
1325 /**
1326 * Print SQL/DB error.
1327 *
1328 * @since 0.71
1329 * @global array $EZSQL_ERROR Stores error information of query and error string
1330 *
1331 * @param string $str The error to display
1332 * @return false|void False if the showing of errors is disabled.
1333 */
1334 public function print_error( $str = '' ) {
1335 global $EZSQL_ERROR;
1336
1337 if ( !$str ) {
1338 if ( $this->use_mysqli ) {
1339 $str = mysqli_error( $this->dbh );
1340 } else {
1341 $str = mysql_error( $this->dbh );
1342 }
1343 }
1344 $EZSQL_ERROR[] = array( 'query' => $this->last_query, 'error_str' => $str );
1345
1346 if ( $this->suppress_errors )
1347 return false;
1348
1349 wp_load_translations_early();
1350
1351 if ( $caller = $this->get_caller() )
1352 $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s made by %3$s' ), $str, $this->last_query, $caller );
1353 else
1354 $error_str = sprintf( __( 'WordPress database error %1$s for query %2$s' ), $str, $this->last_query );
1355
1356 error_log( $error_str );
1357
1358 // Are we showing errors?
1359 if ( ! $this->show_errors )
1360 return false;
1361
1362 // If there is an error then take note of it
1363 if ( is_multisite() ) {
1364 $msg = sprintf(
1365 "%s [%s]\n%s\n",
1366 __( 'WordPress database error:' ),
1367 $str,
1368 $this->last_query
1369 );
1370
1371 if ( defined( 'ERRORLOGFILE' ) ) {
1372 error_log( $msg, 3, ERRORLOGFILE );
1373 }
1374 if ( defined( 'DIEONDBERROR' ) ) {
1375 wp_die( $msg );
1376 }
1377 } else {
1378 $str = htmlspecialchars( $str, ENT_QUOTES );
1379 $query = htmlspecialchars( $this->last_query, ENT_QUOTES );
1380
1381 printf(
1382 '<div id="error"><p class="wpdberror"><strong>%s</strong> [%s]<br /><code>%s</code></p></div>',
1383 __( 'WordPress database error:' ),
1384 $str,
1385 $query
1386 );
1387 }
1388 }
1389
1390 /**
1391 * Enables showing of database errors.
1392 *
1393 * This function should be used only to enable showing of errors.
1394 * wpdb::hide_errors() should be used instead for hiding of errors. However,
1395 * this function can be used to enable and disable showing of database
1396 * errors.
1397 *
1398 * @since 0.71
1399 * @see wpdb::hide_errors()
1400 *
1401 * @param bool $show Whether to show or hide errors
1402 * @return bool Old value for showing errors.
1403 */
1404 public function show_errors( $show = true ) {
1405 $errors = $this->show_errors;
1406 $this->show_errors = $show;
1407 return $errors;
1408 }
1409
1410 /**
1411 * Disables showing of database errors.
1412 *
1413 * By default database errors are not shown.
1414 *
1415 * @since 0.71
1416 * @see wpdb::show_errors()
1417 *
1418 * @return bool Whether showing of errors was active
1419 */
1420 public function hide_errors() {
1421 $show = $this->show_errors;
1422 $this->show_errors = false;
1423 return $show;
1424 }
1425
1426 /**
1427 * Whether to suppress database errors.
1428 *
1429 * By default database errors are suppressed, with a simple
1430 * call to this function they can be enabled.
1431 *
1432 * @since 2.5.0
1433 * @see wpdb::hide_errors()
1434 * @param bool $suppress Optional. New value. Defaults to true.
1435 * @return bool Old value
1436 */
1437 public function suppress_errors( $suppress = true ) {
1438 $errors = $this->suppress_errors;
1439 $this->suppress_errors = (bool) $suppress;
1440 return $errors;
1441 }
1442
1443 /**
1444 * Kill cached query results.
1445 *
1446 * @since 0.71
1447 */
1448 public function flush() {
1449 $this->last_result = array();
1450 $this->col_info = null;
1451 $this->last_query = null;
1452 $this->rows_affected = $this->num_rows = 0;
1453 $this->last_error = '';
1454
1455 if ( $this->use_mysqli && $this->result instanceof mysqli_result ) {
1456 mysqli_free_result( $this->result );
1457 $this->result = null;
1458
1459 // Sanity check before using the handle
1460 if ( empty( $this->dbh ) || !( $this->dbh instanceof mysqli ) ) {
1461 return;
1462 }
1463
1464 // Clear out any results from a multi-query
1465 while ( mysqli_more_results( $this->dbh ) ) {
1466 mysqli_next_result( $this->dbh );
1467 }
1468 } elseif ( is_resource( $this->result ) ) {
1469 mysql_free_result( $this->result );
1470 }
1471 }
1472
1473 /**
1474 * Connect to and select database.
1475 *
1476 * If $allow_bail is false, the lack of database connection will need
1477 * to be handled manually.
1478 *
1479 * @since 3.0.0
1480 * @since 3.9.0 $allow_bail parameter added.
1481 *
1482 * @param bool $allow_bail Optional. Allows the function to bail. Default true.
1483 * @return bool True with a successful connection, false on failure.
1484 */
1485 public function db_connect( $allow_bail = true ) {
1486 $this->is_mysql = true;
1487
1488 /*
1489 * Deprecated in 3.9+ when using MySQLi. No equivalent
1490 * $new_link parameter exists for mysqli_* functions.
1491 */
1492 $new_link = defined( 'MYSQL_NEW_LINK' ) ? MYSQL_NEW_LINK : true;
1493 $client_flags = defined( 'MYSQL_CLIENT_FLAGS' ) ? MYSQL_CLIENT_FLAGS : 0;
1494
1495 if ( $this->use_mysqli ) {
1496 $this->dbh = mysqli_init();
1497
1498 // mysqli_real_connect doesn't support the host param including a port or socket
1499 // like mysql_connect does. This duplicates how mysql_connect detects a port and/or socket file.
1500 $port = null;
1501 $socket = null;
1502 $host = $this->dbhost;
1503 $port_or_socket = strstr( $host, ':' );
1504 if ( ! empty( $port_or_socket ) ) {
1505 $host = substr( $host, 0, strpos( $host, ':' ) );
1506 $port_or_socket = substr( $port_or_socket, 1 );
1507 if ( 0 !== strpos( $port_or_socket, '/' ) ) {
1508 $port = intval( $port_or_socket );
1509 $maybe_socket = strstr( $port_or_socket, ':' );
1510 if ( ! empty( $maybe_socket ) ) {
1511 $socket = substr( $maybe_socket, 1 );
1512 }
1513 } else {
1514 $socket = $port_or_socket;
1515 }
1516 }
1517
1518 if ( WP_DEBUG ) {
1519 mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
1520 } else {
1521 @mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
1522 }
1523
1524 if ( $this->dbh->connect_errno ) {
1525 $this->dbh = null;
1526
1527 /* It's possible ext/mysqli is misconfigured. Fall back to ext/mysql if:
1528 * - We haven't previously connected, and
1529 * - WP_USE_EXT_MYSQL isn't set to false, and
1530 * - ext/mysql is loaded.
1531 */
1532 $attempt_fallback = true;
1533
1534 if ( $this->has_connected ) {
1535 $attempt_fallback = false;
1536 } elseif ( defined( 'WP_USE_EXT_MYSQL' ) && ! WP_USE_EXT_MYSQL ) {
1537 $attempt_fallback = false;
1538 } elseif ( ! function_exists( 'mysql_connect' ) ) {
1539 $attempt_fallback = false;
1540 }
1541
1542 if ( $attempt_fallback ) {
1543 $this->use_mysqli = false;
1544 return $this->db_connect( $allow_bail );
1545 }
1546 }
1547 } else {
1548 if ( WP_DEBUG ) {
1549 $this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
1550 } else {
1551 $this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
1552 }
1553 }
1554
1555 if ( ! $this->dbh && $allow_bail ) {
1556 wp_load_translations_early();
1557
1558 // Load custom DB error template, if present.
1559 if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
1560 require_once( WP_CONTENT_DIR . '/db-error.php' );
1561 die();
1562 }
1563
1564 $message = '<h1>' . __( 'Error establishing a database connection' ) . "</h1>\n";
1565
1566 $message .= '<p>' . sprintf(
1567 /* translators: 1: wp-config.php. 2: database host */
1568 __( 'This either means that the username and password information in your %1$s file is incorrect or we can’t contact the database server at %2$s. This could mean your host’s database server is down.' ),
1569 '<code>wp-config.php</code>',
1570 '<code>' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . '</code>'
1571 ) . "</p>\n";
1572
1573 $message .= "<ul>\n";
1574 $message .= '<li>' . __( 'Are you sure you have the correct username and password?' ) . "</li>\n";
1575 $message .= '<li>' . __( 'Are you sure that you have typed the correct hostname?' ) . "</li>\n";
1576 $message .= '<li>' . __( 'Are you sure that the database server is running?' ) . "</li>\n";
1577 $message .= "</ul>\n";
1578
1579 $message .= '<p>' . sprintf(
1580 /* translators: %s: support forums URL */
1581 __( 'If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href="%s">WordPress Support Forums</a>.' ),
1582 __( 'https://wordpress.org/support/' )
1583 ) . "</p>\n";
1584
1585 $this->bail( $message, 'db_connect_fail' );
1586
1587 return false;
1588 } elseif ( $this->dbh ) {
1589 if ( ! $this->has_connected ) {
1590 $this->init_charset();
1591 }
1592
1593 $this->has_connected = true;
1594
1595 $this->set_charset( $this->dbh );
1596
1597 $this->ready = true;
1598 $this->set_sql_mode();
1599 $this->select( $this->dbname, $this->dbh );
1600
1601 return true;
1602 }
1603
1604 return false;
1605 }
1606
1607 /**
1608 * Checks that the connection to the database is still up. If not, try to reconnect.
1609 *
1610 * If this function is unable to reconnect, it will forcibly die, or if after the
1611 * the {@see 'template_redirect'} hook has been fired, return false instead.
1612 *
1613 * If $allow_bail is false, the lack of database connection will need
1614 * to be handled manually.
1615 *
1616 * @since 3.9.0
1617 *
1618 * @param bool $allow_bail Optional. Allows the function to bail. Default true.
1619 * @return bool|void True if the connection is up.
1620 */
1621 public function check_connection( $allow_bail = true ) {
1622 if ( $this->use_mysqli ) {
1623 if ( ! empty( $this->dbh ) && mysqli_ping( $this->dbh ) ) {
1624 return true;
1625 }
1626 } else {
1627 if ( ! empty( $this->dbh ) && mysql_ping( $this->dbh ) ) {
1628 return true;
1629 }
1630 }
1631
1632 $error_reporting = false;
1633
1634 // Disable warnings, as we don't want to see a multitude of "unable to connect" messages
1635 if ( WP_DEBUG ) {
1636 $error_reporting = error_reporting();
1637 error_reporting( $error_reporting & ~E_WARNING );
1638 }
1639
1640 for ( $tries = 1; $tries <= $this->reconnect_retries; $tries++ ) {
1641 // On the last try, re-enable warnings. We want to see a single instance of the
1642 // "unable to connect" message on the bail() screen, if it appears.
1643 if ( $this->reconnect_retries === $tries && WP_DEBUG ) {
1644 error_reporting( $error_reporting );
1645 }
1646
1647 if ( $this->db_connect( false ) ) {
1648 if ( $error_reporting ) {
1649 error_reporting( $error_reporting );
1650 }
1651
1652 return true;
1653 }
1654
1655 sleep( 1 );
1656 }
1657
1658 // If template_redirect has already happened, it's too late for wp_die()/dead_db().
1659 // Let's just return and hope for the best.
1660 if ( did_action( 'template_redirect' ) ) {
1661 return false;
1662 }
1663
1664 if ( ! $allow_bail ) {
1665 return false;
1666 }
1667
1668 wp_load_translations_early();
1669
1670 $message = '<h1>' . __( 'Error reconnecting to the database' ) . "</h1>\n";
1671
1672 $message .= '<p>' . sprintf(
1673 /* translators: %s: database host */
1674 __( 'This means that we lost contact with the database server at %s. This could mean your host’s database server is down.' ),
1675 '<code>' . htmlspecialchars( $this->dbhost, ENT_QUOTES ) . '</code>'
1676 ) . "</p>\n";
1677
1678 $message .= "<ul>\n";
1679 $message .= '<li>' . __( 'Are you sure that the database server is running?' ) . "</li>\n";
1680 $message .= '<li>' . __( 'Are you sure that the database server is not under particularly heavy load?' ) . "</li>\n";
1681 $message .= "</ul>\n";
1682
1683 $message .= '<p>' . sprintf(
1684 /* translators: %s: support forums URL */
1685 __( 'If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href="%s">WordPress Support Forums</a>.' ),
1686 __( 'https://wordpress.org/support/' )
1687 ) . "</p>\n";
1688
1689 // We weren't able to reconnect, so we better bail.
1690 $this->bail( $message, 'db_connect_fail' );
1691
1692 // Call dead_db() if bail didn't die, because this database is no more. It has ceased to be (at least temporarily).
1693 dead_db();
1694 }
1695
1696 /**
1697 * Perform a MySQL database query, using current database connection.
1698 *
1699 * More information can be found on the codex page.
1700 *
1701 * @since 0.71
1702 *
1703 * @param string $query Database query
1704 * @return int|false Number of rows affected/selected or false on error
1705 */
1706 public function query( $query ) {
1707 if ( ! $this->ready ) {
1708 $this->check_current_query = true;
1709 return false;
1710 }
1711
1712 /**
1713 * Filters the database query.
1714 *
1715 * Some queries are made before the plugins have been loaded,
1716 * and thus cannot be filtered with this method.
1717 *
1718 * @since 2.1.0
1719 *
1720 * @param string $query Database query.
1721 */
1722 $query = apply_filters( 'query', $query );
1723
1724 $this->flush();
1725
1726 // Log how the function was called
1727 $this->func_call = "\$db->query(\"$query\")";
1728
1729 // If we're writing to the database, make sure the query will write safely.
1730 if ( $this->check_current_query && ! $this->check_ascii( $query ) ) {
1731 $stripped_query = $this->strip_invalid_text_from_query( $query );
1732 // strip_invalid_text_from_query() can perform queries, so we need
1733 // to flush again, just to make sure everything is clear.
1734 $this->flush();
1735 if ( $stripped_query !== $query ) {
1736 $this->insert_id = 0;
1737 return false;
1738 }
1739 }
1740
1741 $this->check_current_query = true;
1742
1743 // Keep track of the last query for debug.
1744 $this->last_query = $query;
1745
1746 $this->_do_query( $query );
1747
1748 // MySQL server has gone away, try to reconnect.
1749 $mysql_errno = 0;
1750 if ( ! empty( $this->dbh ) ) {
1751 if ( $this->use_mysqli ) {
1752 if ( $this->dbh instanceof mysqli ) {
1753 $mysql_errno = mysqli_errno( $this->dbh );
1754 } else {
1755 // $dbh is defined, but isn't a real connection.
1756 // Something has gone horribly wrong, let's try a reconnect.
1757 $mysql_errno = 2006;
1758 }
1759 } else {
1760 if ( is_resource( $this->dbh ) ) {
1761 $mysql_errno = mysql_errno( $this->dbh );
1762 } else {
1763 $mysql_errno = 2006;
1764 }
1765 }
1766 }
1767
1768 if ( empty( $this->dbh ) || 2006 == $mysql_errno ) {
1769 if ( $this->check_connection() ) {
1770 $this->_do_query( $query );
1771 } else {
1772 $this->insert_id = 0;
1773 return false;
1774 }
1775 }
1776
1777 // If there is an error then take note of it.
1778 if ( $this->use_mysqli ) {
1779 if ( $this->dbh instanceof mysqli ) {
1780 $this->last_error = mysqli_error( $this->dbh );
1781 } else {
1782 $this->last_error = __( 'Unable to retrieve the error message from MySQL' );
1783 }
1784 } else {
1785 if ( is_resource( $this->dbh ) ) {
1786 $this->last_error = mysql_error( $this->dbh );
1787 } else {
1788 $this->last_error = __( 'Unable to retrieve the error message from MySQL' );
1789 }
1790 }
1791
1792 if ( $this->last_error ) {
1793 // Clear insert_id on a subsequent failed insert.
1794 if ( $this->insert_id && preg_match( '/^\s*(insert|replace)\s/i', $query ) )
1795 $this->insert_id = 0;
1796
1797 $this->print_error();
1798 return false;
1799 }
1800
1801 if ( preg_match( '/^\s*(create|alter|truncate|drop)\s/i', $query ) ) {
1802 $return_val = $this->result;
1803 } elseif ( preg_match( '/^\s*(insert|delete|update|replace)\s/i', $query ) ) {
1804 if ( $this->use_mysqli ) {
1805 $this->rows_affected = mysqli_affected_rows( $this->dbh );
1806 } else {
1807 $this->rows_affected = mysql_affected_rows( $this->dbh );
1808 }
1809 // Take note of the insert_id
1810 if ( preg_match( '/^\s*(insert|replace)\s/i', $query ) ) {
1811 if ( $this->use_mysqli ) {
1812 $this->insert_id = mysqli_insert_id( $this->dbh );
1813 } else {
1814 $this->insert_id = mysql_insert_id( $this->dbh );
1815 }
1816 }
1817 // Return number of rows affected
1818 $return_val = $this->rows_affected;
1819 } else {
1820 $num_rows = 0;
1821 if ( $this->use_mysqli && $this->result instanceof mysqli_result ) {
1822 while ( $row = mysqli_fetch_object( $this->result ) ) {
1823 $this->last_result[$num_rows] = $row;
1824 $num_rows++;
1825 }
1826 } elseif ( is_resource( $this->result ) ) {
1827 while ( $row = mysql_fetch_object( $this->result ) ) {
1828 $this->last_result[$num_rows] = $row;
1829 $num_rows++;
1830 }
1831 }
1832
1833 // Log number of rows the query returned
1834 // and return number of rows selected
1835 $this->num_rows = $num_rows;
1836 $return_val = $num_rows;
1837 }
1838
1839 return $return_val;
1840 }
1841
1842 /**
1843 * Internal function to perform the mysql_query() call.
1844 *
1845 * @since 3.9.0
1846 *
1847 * @access private
1848 * @see wpdb::query()
1849 *
1850 * @param string $query The query to run.
1851 */
1852 private function _do_query( $query ) {
1853 if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) {
1854 $this->timer_start();
1855 }
1856
1857 if ( ! empty( $this->dbh ) && $this->use_mysqli ) {
1858 $this->result = mysqli_query( $this->dbh, $query );
1859 } elseif ( ! empty( $this->dbh ) ) {
1860 $this->result = mysql_query( $query, $this->dbh );
1861 }
1862 $this->num_queries++;
1863
1864 if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) {
1865 $this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
1866 }
1867 }
1868
1869 /**
1870 * Insert a row into a table.
1871 *
1872 * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )
1873 * wpdb::insert( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )
1874 *
1875 * @since 2.5.0
1876 * @see wpdb::prepare()
1877 * @see wpdb::$field_types
1878 * @see wp_set_wpdb_vars()
1879 *
1880 * @param string $table Table name
1881 * @param array $data Data to insert (in column => value pairs).
1882 * Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1883 * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case.
1884 * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data.
1885 * If string, that format will be used for all of the values in $data.
1886 * A format is one of '%d', '%f', '%s' (integer, float, string).
1887 * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1888 * @return int|false The number of rows inserted, or false on error.
1889 */
1890 public function insert( $table, $data, $format = null ) {
1891 return $this->_insert_replace_helper( $table, $data, $format, 'INSERT' );
1892 }
1893
1894 /**
1895 * Replace a row into a table.
1896 *
1897 * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 'bar' ) )
1898 * wpdb::replace( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( '%s', '%d' ) )
1899 *
1900 * @since 3.0.0
1901 * @see wpdb::prepare()
1902 * @see wpdb::$field_types
1903 * @see wp_set_wpdb_vars()
1904 *
1905 * @param string $table Table name
1906 * @param array $data Data to insert (in column => value pairs).
1907 * Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1908 * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case.
1909 * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data.
1910 * If string, that format will be used for all of the values in $data.
1911 * A format is one of '%d', '%f', '%s' (integer, float, string).
1912 * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1913 * @return int|false The number of rows affected, or false on error.
1914 */
1915 public function replace( $table, $data, $format = null ) {
1916 return $this->_insert_replace_helper( $table, $data, $format, 'REPLACE' );
1917 }
1918
1919 /**
1920 * Helper function for insert and replace.
1921 *
1922 * Runs an insert or replace query based on $type argument.
1923 *
1924 * @access private
1925 * @since 3.0.0
1926 * @see wpdb::prepare()
1927 * @see wpdb::$field_types
1928 * @see wp_set_wpdb_vars()
1929 *
1930 * @param string $table Table name
1931 * @param array $data Data to insert (in column => value pairs).
1932 * Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1933 * Sending a null value will cause the column to be set to NULL - the corresponding format is ignored in this case.
1934 * @param array|string $format Optional. An array of formats to be mapped to each of the value in $data.
1935 * If string, that format will be used for all of the values in $data.
1936 * A format is one of '%d', '%f', '%s' (integer, float, string).
1937 * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1938 * @param string $type Optional. What type of operation is this? INSERT or REPLACE. Defaults to INSERT.
1939 * @return int|false The number of rows affected, or false on error.
1940 */
1941 function _insert_replace_helper( $table, $data, $format = null, $type = 'INSERT' ) {
1942 $this->insert_id = 0;
1943
1944 if ( ! in_array( strtoupper( $type ), array( 'REPLACE', 'INSERT' ) ) ) {
1945 return false;
1946 }
1947
1948 $data = $this->process_fields( $table, $data, $format );
1949 if ( false === $data ) {
1950 return false;
1951 }
1952
1953 $formats = $values = array();
1954 foreach ( $data as $value ) {
1955 if ( is_null( $value['value'] ) ) {
1956 $formats[] = 'NULL';
1957 continue;
1958 }
1959
1960 $formats[] = $value['format'];
1961 $values[] = $value['value'];
1962 }
1963
1964 $fields = '`' . implode( '`, `', array_keys( $data ) ) . '`';
1965 $formats = implode( ', ', $formats );
1966
1967 $sql = "$type INTO `$table` ($fields) VALUES ($formats)";
1968
1969 $this->check_current_query = false;
1970 return $this->query( $this->prepare( $sql, $values ) );
1971 }
1972
1973 /**
1974 * Update a row in the table
1975 *
1976 * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 'bar' ), array( 'ID' => 1 ) )
1977 * wpdb::update( 'table', array( 'column' => 'foo', 'field' => 1337 ), array( 'ID' => 1 ), array( '%s', '%d' ), array( '%d' ) )
1978 *
1979 * @since 2.5.0
1980 * @see wpdb::prepare()
1981 * @see wpdb::$field_types
1982 * @see wp_set_wpdb_vars()
1983 *
1984 * @param string $table Table name
1985 * @param array $data Data to update (in column => value pairs).
1986 * Both $data columns and $data values should be "raw" (neither should be SQL escaped).
1987 * Sending a null value will cause the column to be set to NULL - the corresponding
1988 * format is ignored in this case.
1989 * @param array $where A named array of WHERE clauses (in column => value pairs).
1990 * Multiple clauses will be joined with ANDs.
1991 * Both $where columns and $where values should be "raw".
1992 * Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case.
1993 * @param array|string $format Optional. An array of formats to be mapped to each of the values in $data.
1994 * If string, that format will be used for all of the values in $data.
1995 * A format is one of '%d', '%f', '%s' (integer, float, string).
1996 * If omitted, all values in $data will be treated as strings unless otherwise specified in wpdb::$field_types.
1997 * @param array|string $where_format Optional. An array of formats to be mapped to each of the values in $where.
1998 * If string, that format will be used for all of the items in $where.
1999 * A format is one of '%d', '%f', '%s' (integer, float, string).
2000 * If omitted, all values in $where will be treated as strings.
2001 * @return int|false The number of rows updated, or false on error.
2002 */
2003 public function update( $table, $data, $where, $format = null, $where_format = null ) {
2004 if ( ! is_array( $data ) || ! is_array( $where ) ) {
2005 return false;
2006 }
2007
2008 $data = $this->process_fields( $table, $data, $format );
2009 if ( false === $data ) {
2010 return false;
2011 }
2012 $where = $this->process_fields( $table, $where, $where_format );
2013 if ( false === $where ) {
2014 return false;
2015 }
2016
2017 $fields = $conditions = $values = array();
2018 foreach ( $data as $field => $value ) {
2019 if ( is_null( $value['value'] ) ) {
2020 $fields[] = "`$field` = NULL";
2021 continue;
2022 }
2023
2024 $fields[] = "`$field` = " . $value['format'];
2025 $values[] = $value['value'];
2026 }
2027 foreach ( $where as $field => $value ) {
2028 if ( is_null( $value['value'] ) ) {
2029 $conditions[] = "`$field` IS NULL";
2030 continue;
2031 }
2032
2033 $conditions[] = "`$field` = " . $value['format'];
2034 $values[] = $value['value'];
2035 }
2036
2037 $fields = implode( ', ', $fields );
2038 $conditions = implode( ' AND ', $conditions );
2039
2040 $sql = "UPDATE `$table` SET $fields WHERE $conditions";
2041
2042 $this->check_current_query = false;
2043 return $this->query( $this->prepare( $sql, $values ) );
2044 }
2045
2046 /**
2047 * Delete a row in the table
2048 *
2049 * wpdb::delete( 'table', array( 'ID' => 1 ) )
2050 * wpdb::delete( 'table', array( 'ID' => 1 ), array( '%d' ) )
2051 *
2052 * @since 3.4.0
2053 * @see wpdb::prepare()
2054 * @see wpdb::$field_types
2055 * @see wp_set_wpdb_vars()
2056 *
2057 * @param string $table Table name
2058 * @param array $where A named array of WHERE clauses (in column => value pairs).
2059 * Multiple clauses will be joined with ANDs.
2060 * Both $where columns and $where values should be "raw".
2061 * Sending a null value will create an IS NULL comparison - the corresponding format will be ignored in this case.
2062 * @param array|string $where_format Optional. An array of formats to be mapped to each of the values in $where.
2063 * If string, that format will be used for all of the items in $where.
2064 * A format is one of '%d', '%f', '%s' (integer, float, string).
2065 * If omitted, all values in $where will be treated as strings unless otherwise specified in wpdb::$field_types.
2066 * @return int|false The number of rows updated, or false on error.
2067 */
2068 public function delete( $table, $where, $where_format = null ) {
2069 if ( ! is_array( $where ) ) {
2070 return false;
2071 }
2072
2073 $where = $this->process_fields( $table, $where, $where_format );
2074 if ( false === $where ) {
2075 return false;
2076 }
2077
2078 $conditions = $values = array();
2079 foreach ( $where as $field => $value ) {
2080 if ( is_null( $value['value'] ) ) {
2081 $conditions[] = "`$field` IS NULL";
2082 continue;
2083 }
2084
2085 $conditions[] = "`$field` = " . $value['format'];
2086 $values[] = $value['value'];
2087 }
2088
2089 $conditions = implode( ' AND ', $conditions );
2090
2091 $sql = "DELETE FROM `$table` WHERE $conditions";
2092
2093 $this->check_current_query = false;
2094 return $this->query( $this->prepare( $sql, $values ) );
2095 }
2096
2097 /**
2098 * Processes arrays of field/value pairs and field formats.
2099 *
2100 * This is a helper method for wpdb's CRUD methods, which take field/value
2101 * pairs for inserts, updates, and where clauses. This method first pairs
2102 * each value with a format. Then it determines the charset of that field,
2103 * using that to determine if any invalid text would be stripped. If text is
2104 * stripped, then field processing is rejected and the query fails.
2105 *
2106 * @since 4.2.0
2107 * @access protected
2108 *
2109 * @param string $table Table name.
2110 * @param array $data Field/value pair.
2111 * @param mixed $format Format for each field.
2112 * @return array|false Returns an array of fields that contain paired values
2113 * and formats. Returns false for invalid values.
2114 */
2115 protected function process_fields( $table, $data, $format ) {
2116 $data = $this->process_field_formats( $data, $format );
2117 if ( false === $data ) {
2118 return false;
2119 }
2120
2121 $data = $this->process_field_charsets( $data, $table );
2122 if ( false === $data ) {
2123 return false;
2124 }
2125
2126 $data = $this->process_field_lengths( $data, $table );
2127 if ( false === $data ) {
2128 return false;
2129 }
2130
2131 $converted_data = $this->strip_invalid_text( $data );
2132
2133 if ( $data !== $converted_data ) {
2134 return false;
2135 }
2136
2137 return $data;
2138 }
2139
2140 /**
2141 * Prepares arrays of value/format pairs as passed to wpdb CRUD methods.
2142 *
2143 * @since 4.2.0
2144 * @access protected
2145 *
2146 * @param array $data Array of fields to values.
2147 * @param mixed $format Formats to be mapped to the values in $data.
2148 * @return array Array, keyed by field names with values being an array
2149 * of 'value' and 'format' keys.
2150 */
2151 protected function process_field_formats( $data, $format ) {
2152 $formats = $original_formats = (array) $format;
2153
2154 foreach ( $data as $field => $value ) {
2155 $value = array(
2156 'value' => $value,
2157 'format' => '%s',
2158 );
2159
2160 if ( ! empty( $format ) ) {
2161 $value['format'] = array_shift( $formats );
2162 if ( ! $value['format'] ) {
2163 $value['format'] = reset( $original_formats );
2164 }
2165 } elseif ( isset( $this->field_types[ $field ] ) ) {
2166 $value['format'] = $this->field_types[ $field ];
2167 }
2168
2169 $data[ $field ] = $value;
2170 }
2171
2172 return $data;
2173 }
2174
2175 /**
2176 * Adds field charsets to field/value/format arrays generated by
2177 * the wpdb::process_field_formats() method.
2178 *
2179 * @since 4.2.0
2180 * @access protected
2181 *
2182 * @param array $data As it comes from the wpdb::process_field_formats() method.
2183 * @param string $table Table name.
2184 * @return array|false The same array as $data with additional 'charset' keys.
2185 */
2186 protected function process_field_charsets( $data, $table ) {
2187 foreach ( $data as $field => $value ) {
2188 if ( '%d' === $value['format'] || '%f' === $value['format'] ) {
2189 /*
2190 * We can skip this field if we know it isn't a string.
2191 * This checks %d/%f versus ! %s because its sprintf() could take more.
2192 */
2193 $value['charset'] = false;
2194 } else {
2195 $value['charset'] = $this->get_col_charset( $table, $field );
2196 if ( is_wp_error( $value['charset'] ) ) {
2197 return false;
2198 }
2199 }
2200
2201 $data[ $field ] = $value;
2202 }
2203
2204 return $data;
2205 }
2206
2207 /**
2208 * For string fields, record the maximum string length that field can safely save.
2209 *
2210 * @since 4.2.1
2211 * @access protected
2212 *
2213 * @param array $data As it comes from the wpdb::process_field_charsets() method.
2214 * @param string $table Table name.
2215 * @return array|false The same array as $data with additional 'length' keys, or false if
2216 * any of the values were too long for their corresponding field.
2217 */
2218 protected function process_field_lengths( $data, $table ) {
2219 foreach ( $data as $field => $value ) {
2220 if ( '%d' === $value['format'] || '%f' === $value['format'] ) {
2221 /*
2222 * We can skip this field if we know it isn't a string.
2223 * This checks %d/%f versus ! %s because its sprintf() could take more.
2224 */
2225 $value['length'] = false;
2226 } else {
2227 $value['length'] = $this->get_col_length( $table, $field );
2228 if ( is_wp_error( $value['length'] ) ) {
2229 return false;
2230 }
2231 }
2232
2233 $data[ $field ] = $value;
2234 }
2235
2236 return $data;
2237 }
2238
2239 /**
2240 * Retrieve one variable from the database.
2241 *
2242 * Executes a SQL query and returns the value from the SQL result.
2243 * If the SQL result contains more than one column and/or more than one row, this function returns the value in the column and row specified.
2244 * If $query is null, this function returns the value in the specified column and row from the previous SQL result.
2245 *
2246 * @since 0.71
2247 *
2248 * @param string|null $query Optional. SQL query. Defaults to null, use the result from the previous query.
2249 * @param int $x Optional. Column of value to return. Indexed from 0.
2250 * @param int $y Optional. Row of value to return. Indexed from 0.
2251 * @return string|null Database query result (as string), or null on failure
2252 */
2253 public function get_var( $query = null, $x = 0, $y = 0 ) {
2254 $this->func_call = "\$db->get_var(\"$query\", $x, $y)";
2255
2256 if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
2257 $this->check_current_query = false;
2258 }
2259
2260 if ( $query ) {
2261 $this->query( $query );
2262 }
2263
2264 // Extract var out of cached results based x,y vals
2265 if ( !empty( $this->last_result[$y] ) ) {
2266 $values = array_values( get_object_vars( $this->last_result[$y] ) );
2267 }
2268
2269 // If there is a value return it else return null
2270 return ( isset( $values[$x] ) && $values[$x] !== '' ) ? $values[$x] : null;
2271 }
2272
2273 /**
2274 * Retrieve one row from the database.
2275 *
2276 * Executes a SQL query and returns the row from the SQL result.
2277 *
2278 * @since 0.71
2279 *
2280 * @param string|null $query SQL query.
2281 * @param string $output Optional. one of ARRAY_A | ARRAY_N | OBJECT constants.
2282 * Return an associative array (column => value, ...),
2283 * a numerically indexed array (0 => value, ...) or
2284 * an object ( ->column = value ), respectively.
2285 * @param int $y Optional. Row to return. Indexed from 0.
2286 * @return array|object|null|void Database query result in format specified by $output or null on failure
2287 */
2288 public function get_row( $query = null, $output = OBJECT, $y = 0 ) {
2289 $this->func_call = "\$db->get_row(\"$query\",$output,$y)";
2290
2291 if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
2292 $this->check_current_query = false;
2293 }
2294
2295 if ( $query ) {
2296 $this->query( $query );
2297 } else {
2298 return null;
2299 }
2300
2301 if ( !isset( $this->last_result[$y] ) )
2302 return null;
2303
2304 if ( $output == OBJECT ) {
2305 return $this->last_result[$y] ? $this->last_result[$y] : null;
2306 } elseif ( $output == ARRAY_A ) {
2307 return $this->last_result[$y] ? get_object_vars( $this->last_result[$y] ) : null;
2308 } elseif ( $output == ARRAY_N ) {
2309 return $this->last_result[$y] ? array_values( get_object_vars( $this->last_result[$y] ) ) : null;
2310 } elseif ( strtoupper( $output ) === OBJECT ) {
2311 // Back compat for OBJECT being previously case insensitive.
2312 return $this->last_result[$y] ? $this->last_result[$y] : null;
2313 } else {
2314 $this->print_error( " \$db->get_row(string query, output type, int offset) -- Output type must be one of: OBJECT, ARRAY_A, ARRAY_N" );
2315 }
2316 }
2317
2318 /**
2319 * Retrieve one column from the database.
2320 *
2321 * Executes a SQL query and returns the column from the SQL result.
2322 * If the SQL result contains more than one column, this function returns the column specified.
2323 * If $query is null, this function returns the specified column from the previous SQL result.
2324 *
2325 * @since 0.71
2326 *
2327 * @param string|null $query Optional. SQL query. Defaults to previous query.
2328 * @param int $x Optional. Column to return. Indexed from 0.
2329 * @return array Database query result. Array indexed from 0 by SQL result row number.
2330 */
2331 public function get_col( $query = null , $x = 0 ) {
2332 if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
2333 $this->check_current_query = false;
2334 }
2335
2336 if ( $query ) {
2337 $this->query( $query );
2338 }
2339
2340 $new_array = array();
2341 // Extract the column values
2342 for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) {
2343 $new_array[$i] = $this->get_var( null, $x, $i );
2344 }
2345 return $new_array;
2346 }
2347
2348 /**
2349 * Retrieve an entire SQL result set from the database (i.e., many rows)
2350 *
2351 * Executes a SQL query and returns the entire SQL result.
2352 *
2353 * @since 0.71
2354 *
2355 * @param string $query SQL query.
2356 * @param string $output Optional. Any of ARRAY_A | ARRAY_N | OBJECT | OBJECT_K constants.
2357 * With one of the first three, return an array of rows indexed from 0 by SQL result row number.
2358 * Each row is an associative array (column => value, ...), a numerically indexed array (0 => value, ...), or an object. ( ->column = value ), respectively.
2359 * With OBJECT_K, return an associative array of row objects keyed by the value of each row's first column's value.
2360 * Duplicate keys are discarded.
2361 * @return array|object|null Database query results
2362 */
2363 public function get_results( $query = null, $output = OBJECT ) {
2364 $this->func_call = "\$db->get_results(\"$query\", $output)";
2365
2366 if ( $this->check_current_query && $this->check_safe_collation( $query ) ) {
2367 $this->check_current_query = false;
2368 }
2369
2370 if ( $query ) {
2371 $this->query( $query );
2372 } else {
2373 return null;
2374 }
2375
2376 $new_array = array();
2377 if ( $output == OBJECT ) {
2378 // Return an integer-keyed array of row objects
2379 return $this->last_result;
2380 } elseif ( $output == OBJECT_K ) {
2381 // Return an array of row objects with keys from column 1
2382 // (Duplicates are discarded)
2383 foreach ( $this->last_result as $row ) {
2384 $var_by_ref = get_object_vars( $row );
2385 $key = array_shift( $var_by_ref );
2386 if ( ! isset( $new_array[ $key ] ) )
2387 $new_array[ $key ] = $row;
2388 }
2389 return $new_array;
2390 } elseif ( $output == ARRAY_A || $output == ARRAY_N ) {
2391 // Return an integer-keyed array of...
2392 if ( $this->last_result ) {
2393 foreach ( (array) $this->last_result as $row ) {
2394 if ( $output == ARRAY_N ) {
2395 // ...integer-keyed row arrays
2396 $new_array[] = array_values( get_object_vars( $row ) );
2397 } else {
2398 // ...column name-keyed row arrays
2399 $new_array[] = get_object_vars( $row );
2400 }
2401 }
2402 }
2403 return $new_array;
2404 } elseif ( strtoupper( $output ) === OBJECT ) {
2405 // Back compat for OBJECT being previously case insensitive.
2406 return $this->last_result;
2407 }
2408 return null;
2409 }
2410
2411 /**
2412 * Retrieves the character set for the given table.
2413 *
2414 * @since 4.2.0
2415 * @access protected
2416 *
2417 * @param string $table Table name.
2418 * @return string|WP_Error Table character set, WP_Error object if it couldn't be found.
2419 */
2420 protected function get_table_charset( $table ) {
2421 $tablekey = strtolower( $table );
2422
2423 /**
2424 * Filters the table charset value before the DB is checked.
2425 *
2426 * Passing a non-null value to the filter will effectively short-circuit
2427 * checking the DB for the charset, returning that value instead.
2428 *
2429 * @since 4.2.0
2430 *
2431 * @param string $charset The character set to use. Default null.
2432 * @param string $table The name of the table being checked.
2433 */
2434 $charset = apply_filters( 'pre_get_table_charset', null, $table );
2435 if ( null !== $charset ) {
2436 return $charset;
2437 }
2438
2439 if ( isset( $this->table_charset[ $tablekey ] ) ) {
2440 return $this->table_charset[ $tablekey ];
2441 }
2442
2443 $charsets = $columns = array();
2444
2445 $table_parts = explode( '.', $table );
2446 $table = '`' . implode( '`.`', $table_parts ) . '`';
2447 $results = $this->get_results( "SHOW FULL COLUMNS FROM $table" );
2448 if ( ! $results ) {
2449 return new WP_Error( 'wpdb_get_table_charset_failure' );
2450 }
2451
2452 foreach ( $results as $column ) {
2453 $columns[ strtolower( $column->Field ) ] = $column;
2454 }
2455
2456 $this->col_meta[ $tablekey ] = $columns;
2457
2458 foreach ( $columns as $column ) {
2459 if ( ! empty( $column->Collation ) ) {
2460 list( $charset ) = explode( '_', $column->Collation );
2461
2462 // If the current connection can't support utf8mb4 characters, let's only send 3-byte utf8 characters.
2463 if ( 'utf8mb4' === $charset && ! $this->has_cap( 'utf8mb4' ) ) {
2464 $charset = 'utf8';
2465 }
2466
2467 $charsets[ strtolower( $charset ) ] = true;
2468 }
2469
2470 list( $type ) = explode( '(', $column->Type );
2471
2472 // A binary/blob means the whole query gets treated like this.
2473 if ( in_array( strtoupper( $type ), array( 'BINARY', 'VARBINARY', 'TINYBLOB', 'MEDIUMBLOB', 'BLOB', 'LONGBLOB' ) ) ) {
2474 $this->table_charset[ $tablekey ] = 'binary';
2475 return 'binary';
2476 }
2477 }
2478
2479 // utf8mb3 is an alias for utf8.
2480 if ( isset( $charsets['utf8mb3'] ) ) {
2481 $charsets['utf8'] = true;
2482 unset( $charsets['utf8mb3'] );
2483 }
2484
2485 // Check if we have more than one charset in play.
2486 $count = count( $charsets );
2487 if ( 1 === $count ) {
2488 $charset = key( $charsets );
2489 } elseif ( 0 === $count ) {
2490 // No charsets, assume this table can store whatever.
2491 $charset = false;
2492 } else {
2493 // More than one charset. Remove latin1 if present and recalculate.
2494 unset( $charsets['latin1'] );
2495 $count = count( $charsets );
2496 if ( 1 === $count ) {
2497 // Only one charset (besides latin1).
2498 $charset = key( $charsets );
2499 } elseif ( 2 === $count && isset( $charsets['utf8'], $charsets['utf8mb4'] ) ) {
2500 // Two charsets, but they're utf8 and utf8mb4, use utf8.
2501 $charset = 'utf8';
2502 } else {
2503 // Two mixed character sets. ascii.
2504 $charset = 'ascii';
2505 }
2506 }
2507
2508 $this->table_charset[ $tablekey ] = $charset;
2509 return $charset;
2510 }
2511
2512 /**
2513 * Retrieves the character set for the given column.
2514 *
2515 * @since 4.2.0
2516 * @access public
2517 *
2518 * @param string $table Table name.
2519 * @param string $column Column name.
2520 * @return string|false|WP_Error Column character set as a string. False if the column has no
2521 * character set. WP_Error object if there was an error.
2522 */
2523 public function get_col_charset( $table, $column ) {
2524 $tablekey = strtolower( $table );
2525 $columnkey = strtolower( $column );
2526
2527 /**
2528 * Filters the column charset value before the DB is checked.
2529 *
2530 * Passing a non-null value to the filter will short-circuit
2531 * checking the DB for the charset, returning that value instead.
2532 *
2533 * @since 4.2.0
2534 *
2535 * @param string $charset The character set to use. Default null.
2536 * @param string $table The name of the table being checked.
2537 * @param string $column The name of the column being checked.
2538 */
2539 $charset = apply_filters( 'pre_get_col_charset', null, $table, $column );
2540 if ( null !== $charset ) {
2541 return $charset;
2542 }
2543
2544 // Skip this entirely if this isn't a MySQL database.
2545 if ( empty( $this->is_mysql ) ) {
2546 return false;
2547 }
2548
2549 if ( empty( $this->table_charset[ $tablekey ] ) ) {
2550 // This primes column information for us.
2551 $table_charset = $this->get_table_charset( $table );
2552 if ( is_wp_error( $table_charset ) ) {
2553 return $table_charset;
2554 }
2555 }
2556
2557 // If still no column information, return the table charset.
2558 if ( empty( $this->col_meta[ $tablekey ] ) ) {
2559 return $this->table_charset[ $tablekey ];
2560 }
2561
2562 // If this column doesn't exist, return the table charset.
2563 if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) {
2564 return $this->table_charset[ $tablekey ];
2565 }
2566
2567 // Return false when it's not a string column.
2568 if ( empty( $this->col_meta[ $tablekey ][ $columnkey ]->Collation ) ) {
2569 return false;
2570 }
2571
2572 list( $charset ) = explode( '_', $this->col_meta[ $tablekey ][ $columnkey ]->Collation );
2573 return $charset;
2574 }
2575
2576 /**
2577 * Retrieve the maximum string length allowed in a given column.
2578 * The length may either be specified as a byte length or a character length.
2579 *
2580 * @since 4.2.1
2581 * @access public
2582 *
2583 * @param string $table Table name.
2584 * @param string $column Column name.
2585 * @return array|false|WP_Error array( 'length' => (int), 'type' => 'byte' | 'char' )
2586 * false if the column has no length (for example, numeric column)
2587 * WP_Error object if there was an error.
2588 */
2589 public function get_col_length( $table, $column ) {
2590 $tablekey = strtolower( $table );
2591 $columnkey = strtolower( $column );
2592
2593 // Skip this entirely if this isn't a MySQL database.
2594 if ( empty( $this->is_mysql ) ) {
2595 return false;
2596 }
2597
2598 if ( empty( $this->col_meta[ $tablekey ] ) ) {
2599 // This primes column information for us.
2600 $table_charset = $this->get_table_charset( $table );
2601 if ( is_wp_error( $table_charset ) ) {
2602 return $table_charset;
2603 }
2604 }
2605
2606 if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) {
2607 return false;
2608 }
2609
2610 $typeinfo = explode( '(', $this->col_meta[ $tablekey ][ $columnkey ]->Type );
2611
2612 $type = strtolower( $typeinfo[0] );
2613 if ( ! empty( $typeinfo[1] ) ) {
2614 $length = trim( $typeinfo[1], ')' );
2615 } else {
2616 $length = false;
2617 }
2618
2619 switch( $type ) {
2620 case 'char':
2621 case 'varchar':
2622 return array(
2623 'type' => 'char',
2624 'length' => (int) $length,
2625 );
2626
2627 case 'binary':
2628 case 'varbinary':
2629 return array(
2630 'type' => 'byte',
2631 'length' => (int) $length,
2632 );
2633
2634 case 'tinyblob':
2635 case 'tinytext':
2636 return array(
2637 'type' => 'byte',
2638 'length' => 255, // 2^8 - 1
2639 );
2640
2641 case 'blob':
2642 case 'text':
2643 return array(
2644 'type' => 'byte',
2645 'length' => 65535, // 2^16 - 1
2646 );
2647
2648 case 'mediumblob':
2649 case 'mediumtext':
2650 return array(
2651 'type' => 'byte',
2652 'length' => 16777215, // 2^24 - 1
2653 );
2654
2655 case 'longblob':
2656 case 'longtext':
2657 return array(
2658 'type' => 'byte',
2659 'length' => 4294967295, // 2^32 - 1
2660 );
2661
2662 default:
2663 return false;
2664 }
2665 }
2666
2667 /**
2668 * Check if a string is ASCII.
2669 *
2670 * The negative regex is faster for non-ASCII strings, as it allows
2671 * the search to finish as soon as it encounters a non-ASCII character.
2672 *
2673 * @since 4.2.0
2674 * @access protected
2675 *
2676 * @param string $string String to check.
2677 * @return bool True if ASCII, false if not.
2678 */
2679 protected function check_ascii( $string ) {
2680 if ( function_exists( 'mb_check_encoding' ) ) {
2681 if ( mb_check_encoding( $string, 'ASCII' ) ) {
2682 return true;
2683 }
2684 } elseif ( ! preg_match( '/[^\x00-\x7F]/', $string ) ) {
2685 return true;
2686 }
2687
2688 return false;
2689 }
2690
2691 /**
2692 * Check if the query is accessing a collation considered safe on the current version of MySQL.
2693 *
2694 * @since 4.2.0
2695 * @access protected
2696 *
2697 * @param string $query The query to check.
2698 * @return bool True if the collation is safe, false if it isn't.
2699 */
2700 protected function check_safe_collation( $query ) {
2701 if ( $this->checking_collation ) {
2702 return true;
2703 }
2704
2705 // We don't need to check the collation for queries that don't read data.
2706 $query = ltrim( $query, "\r\n\t (" );
2707 if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $query ) ) {
2708 return true;
2709 }
2710
2711 // All-ASCII queries don't need extra checking.
2712 if ( $this->check_ascii( $query ) ) {
2713 return true;
2714 }
2715
2716 $table = $this->get_table_from_query( $query );
2717 if ( ! $table ) {
2718 return false;
2719 }
2720
2721 $this->checking_collation = true;
2722 $collation = $this->get_table_charset( $table );
2723 $this->checking_collation = false;
2724
2725 // Tables with no collation, or latin1 only, don't need extra checking.
2726 if ( false === $collation || 'latin1' === $collation ) {
2727 return true;
2728 }
2729
2730 $table = strtolower( $table );
2731 if ( empty( $this->col_meta[ $table ] ) ) {
2732 return false;
2733 }
2734
2735 // If any of the columns don't have one of these collations, it needs more sanity checking.
2736 foreach ( $this->col_meta[ $table ] as $col ) {
2737 if ( empty( $col->Collation ) ) {
2738 continue;
2739 }
2740
2741 if ( ! in_array( $col->Collation, array( 'utf8_general_ci', 'utf8_bin', 'utf8mb4_general_ci', 'utf8mb4_bin' ), true ) ) {
2742 return false;
2743 }
2744 }
2745
2746 return true;
2747 }
2748
2749 /**
2750 * Strips any invalid characters based on value/charset pairs.
2751 *
2752 * @since 4.2.0
2753 * @access protected
2754 *
2755 * @param array $data Array of value arrays. Each value array has the keys
2756 * 'value' and 'charset'. An optional 'ascii' key can be
2757 * set to false to avoid redundant ASCII checks.
2758 * @return array|WP_Error The $data parameter, with invalid characters removed from
2759 * each value. This works as a passthrough: any additional keys
2760 * such as 'field' are retained in each value array. If we cannot
2761 * remove invalid characters, a WP_Error object is returned.
2762 */
2763 protected function strip_invalid_text( $data ) {
2764 $db_check_string = false;
2765
2766 foreach ( $data as &$value ) {
2767 $charset = $value['charset'];
2768
2769 if ( is_array( $value['length'] ) ) {
2770 $length = $value['length']['length'];
2771 $truncate_by_byte_length = 'byte' === $value['length']['type'];
2772 } else {
2773 $length = false;
2774 // Since we have no length, we'll never truncate.
2775 // Initialize the variable to false. true would take us
2776 // through an unnecessary (for this case) codepath below.
2777 $truncate_by_byte_length = false;
2778 }
2779
2780 // There's no charset to work with.
2781 if ( false === $charset ) {
2782 continue;
2783 }
2784
2785 // Column isn't a string.
2786 if ( ! is_string( $value['value'] ) ) {
2787 continue;
2788 }
2789
2790 $needs_validation = true;
2791 if (
2792 // latin1 can store any byte sequence
2793 'latin1' === $charset
2794 ||
2795 // ASCII is always OK.
2796 ( ! isset( $value['ascii'] ) && $this->check_ascii( $value['value'] ) )
2797 ) {
2798 $truncate_by_byte_length = true;
2799 $needs_validation = false;
2800 }
2801
2802 if ( $truncate_by_byte_length ) {
2803 mbstring_binary_safe_encoding();
2804 if ( false !== $length && strlen( $value['value'] ) > $length ) {
2805 $value['value'] = substr( $value['value'], 0, $length );
2806 }
2807 reset_mbstring_encoding();
2808
2809 if ( ! $needs_validation ) {
2810 continue;
2811 }
2812 }
2813
2814 // utf8 can be handled by regex, which is a bunch faster than a DB lookup.
2815 if ( ( 'utf8' === $charset || 'utf8mb3' === $charset || 'utf8mb4' === $charset ) && function_exists( 'mb_strlen' ) ) {
2816 $regex = '/
2817 (
2818 (?: [\x00-\x7F] # single-byte sequences 0xxxxxxx
2819 | [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
2820 | \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
2821 | [\xE1-\xEC][\x80-\xBF]{2}
2822 | \xED[\x80-\x9F][\x80-\xBF]
2823 | [\xEE-\xEF][\x80-\xBF]{2}';
2824
2825 if ( 'utf8mb4' === $charset ) {
2826 $regex .= '
2827 | \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
2828 | [\xF1-\xF3][\x80-\xBF]{3}
2829 | \xF4[\x80-\x8F][\x80-\xBF]{2}
2830 ';
2831 }
2832
2833 $regex .= '){1,40} # ...one or more times
2834 )
2835 | . # anything else
2836 /x';
2837 $value['value'] = preg_replace( $regex, '$1', $value['value'] );
2838
2839
2840 if ( false !== $length && mb_strlen( $value['value'], 'UTF-8' ) > $length ) {
2841 $value['value'] = mb_substr( $value['value'], 0, $length, 'UTF-8' );
2842 }
2843 continue;
2844 }
2845
2846 // We couldn't use any local conversions, send it to the DB.
2847 $value['db'] = $db_check_string = true;
2848 }
2849 unset( $value ); // Remove by reference.
2850
2851 if ( $db_check_string ) {
2852 $queries = array();
2853 foreach ( $data as $col => $value ) {
2854 if ( ! empty( $value['db'] ) ) {
2855 // We're going to need to truncate by characters or bytes, depending on the length value we have.
2856 if ( 'byte' === $value['length']['type'] ) {
2857 // Using binary causes LEFT() to truncate by bytes.
2858 $charset = 'binary';
2859 } else {
2860 $charset = $value['charset'];
2861 }
2862
2863 if ( $this->charset ) {
2864 $connection_charset = $this->charset;
2865 } else {
2866 if ( $this->use_mysqli ) {
2867 $connection_charset = mysqli_character_set_name( $this->dbh );
2868 } else {
2869 $connection_charset = mysql_client_encoding();
2870 }
2871 }
2872
2873 if ( is_array( $value['length'] ) ) {
2874 $queries[ $col ] = $this->prepare( "CONVERT( LEFT( CONVERT( %s USING $charset ), %.0f ) USING $connection_charset )", $value['value'], $value['length']['length'] );
2875 } else if ( 'binary' !== $charset ) {
2876 // If we don't have a length, there's no need to convert binary - it will always return the same result.
2877 $queries[ $col ] = $this->prepare( "CONVERT( CONVERT( %s USING $charset ) USING $connection_charset )", $value['value'] );
2878 }
2879
2880 unset( $data[ $col ]['db'] );
2881 }
2882 }
2883
2884 $sql = array();
2885 foreach ( $queries as $column => $query ) {
2886 if ( ! $query ) {
2887 continue;
2888 }
2889
2890 $sql[] = $query . " AS x_$column";
2891 }
2892
2893 $this->check_current_query = false;
2894 $row = $this->get_row( "SELECT " . implode( ', ', $sql ), ARRAY_A );
2895 if ( ! $row ) {
2896 return new WP_Error( 'wpdb_strip_invalid_text_failure' );
2897 }
2898
2899 foreach ( array_keys( $data ) as $column ) {
2900 if ( isset( $row["x_$column"] ) ) {
2901 $data[ $column ]['value'] = $row["x_$column"];
2902 }
2903 }
2904 }
2905
2906 return $data;
2907 }
2908
2909 /**
2910 * Strips any invalid characters from the query.
2911 *
2912 * @since 4.2.0
2913 * @access protected
2914 *
2915 * @param string $query Query to convert.
2916 * @return string|WP_Error The converted query, or a WP_Error object if the conversion fails.
2917 */
2918 protected function strip_invalid_text_from_query( $query ) {
2919 // We don't need to check the collation for queries that don't read data.
2920 $trimmed_query = ltrim( $query, "\r\n\t (" );
2921 if ( preg_match( '/^(?:SHOW|DESCRIBE|DESC|EXPLAIN|CREATE)\s/i', $trimmed_query ) ) {
2922 return $query;
2923 }
2924
2925 $table = $this->get_table_from_query( $query );
2926 if ( $table ) {
2927 $charset = $this->get_table_charset( $table );
2928 if ( is_wp_error( $charset ) ) {
2929 return $charset;
2930 }
2931
2932 // We can't reliably strip text from tables containing binary/blob columns
2933 if ( 'binary' === $charset ) {
2934 return $query;
2935 }
2936 } else {
2937 $charset = $this->charset;
2938 }
2939
2940 $data = array(
2941 'value' => $query,
2942 'charset' => $charset,
2943 'ascii' => false,
2944 'length' => false,
2945 );
2946
2947 $data = $this->strip_invalid_text( array( $data ) );
2948 if ( is_wp_error( $data ) ) {
2949 return $data;
2950 }
2951
2952 return $data[0]['value'];
2953 }
2954
2955 /**
2956 * Strips any invalid characters from the string for a given table and column.
2957 *
2958 * @since 4.2.0
2959 * @access public
2960 *
2961 * @param string $table Table name.
2962 * @param string $column Column name.
2963 * @param string $value The text to check.
2964 * @return string|WP_Error The converted string, or a WP_Error object if the conversion fails.
2965 */
2966 public function strip_invalid_text_for_column( $table, $column, $value ) {
2967 if ( ! is_string( $value ) ) {
2968 return $value;
2969 }
2970
2971 $charset = $this->get_col_charset( $table, $column );
2972 if ( ! $charset ) {
2973 // Not a string column.
2974 return $value;
2975 } elseif ( is_wp_error( $charset ) ) {
2976 // Bail on real errors.
2977 return $charset;
2978 }
2979
2980 $data = array(
2981 $column => array(
2982 'value' => $value,
2983 'charset' => $charset,
2984 'length' => $this->get_col_length( $table, $column ),
2985 )
2986 );
2987
2988 $data = $this->strip_invalid_text( $data );
2989 if ( is_wp_error( $data ) ) {
2990 return $data;
2991 }
2992
2993 return $data[ $column ]['value'];
2994 }
2995
2996 /**
2997 * Find the first table name referenced in a query.
2998 *
2999 * @since 4.2.0
3000 * @access protected
3001 *
3002 * @param string $query The query to search.
3003 * @return string|false $table The table name found, or false if a table couldn't be found.
3004 */
3005 protected function get_table_from_query( $query ) {
3006 // Remove characters that can legally trail the table name.
3007 $query = rtrim( $query, ';/-#' );
3008
3009 // Allow (select...) union [...] style queries. Use the first query's table name.
3010 $query = ltrim( $query, "\r\n\t (" );
3011
3012 // Strip everything between parentheses except nested selects.
3013 $query = preg_replace( '/\((?!\s*select)[^(]*?\)/is', '()', $query );
3014
3015 // Quickly match most common queries.
3016 if ( preg_match( '/^\s*(?:'
3017 . 'SELECT.*?\s+FROM'
3018 . '|INSERT(?:\s+LOW_PRIORITY|\s+DELAYED|\s+HIGH_PRIORITY)?(?:\s+IGNORE)?(?:\s+INTO)?'
3019 . '|REPLACE(?:\s+LOW_PRIORITY|\s+DELAYED)?(?:\s+INTO)?'
3020 . '|UPDATE(?:\s+LOW_PRIORITY)?(?:\s+IGNORE)?'
3021 . '|DELETE(?:\s+LOW_PRIORITY|\s+QUICK|\s+IGNORE)*(?:\s+FROM)?'
3022 . ')\s+((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)/is', $query, $maybe ) ) {
3023 return str_replace( '`', '', $maybe[1] );
3024 }
3025
3026 // SHOW TABLE STATUS and SHOW TABLES
3027 if ( preg_match( '/^\s*(?:'
3028 . 'SHOW\s+TABLE\s+STATUS.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)'
3029 . '|SHOW\s+(?:FULL\s+)?TABLES.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)'
3030 . ')\W((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)\W/is', $query, $maybe ) ) {
3031 return str_replace( '`', '', $maybe[1] );
3032 }
3033
3034 // Big pattern for the rest of the table-related queries.
3035 if ( preg_match( '/^\s*(?:'
3036 . '(?:EXPLAIN\s+(?:EXTENDED\s+)?)?SELECT.*?\s+FROM'
3037 . '|DESCRIBE|DESC|EXPLAIN|HANDLER'
3038 . '|(?:LOCK|UNLOCK)\s+TABLE(?:S)?'
3039 . '|(?:RENAME|OPTIMIZE|BACKUP|RESTORE|CHECK|CHECKSUM|ANALYZE|REPAIR).*\s+TABLE'
3040 . '|TRUNCATE(?:\s+TABLE)?'
3041 . '|CREATE(?:\s+TEMPORARY)?\s+TABLE(?:\s+IF\s+NOT\s+EXISTS)?'
3042 . '|ALTER(?:\s+IGNORE)?\s+TABLE'
3043 . '|DROP\s+TABLE(?:\s+IF\s+EXISTS)?'
3044 . '|CREATE(?:\s+\w+)?\s+INDEX.*\s+ON'
3045 . '|DROP\s+INDEX.*\s+ON'
3046 . '|LOAD\s+DATA.*INFILE.*INTO\s+TABLE'
3047 . '|(?:GRANT|REVOKE).*ON\s+TABLE'
3048 . '|SHOW\s+(?:.*FROM|.*TABLE)'
3049 . ')\s+\(*\s*((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)\s*\)*/is', $query, $maybe ) ) {
3050 return str_replace( '`', '', $maybe[1] );
3051 }
3052
3053 return false;
3054 }
3055
3056 /**
3057 * Load the column metadata from the last query.
3058 *
3059 * @since 3.5.0
3060 *
3061 * @access protected
3062 */
3063 protected function load_col_info() {
3064 if ( $this->col_info )
3065 return;
3066
3067 if ( $this->use_mysqli ) {
3068 $num_fields = mysqli_num_fields( $this->result );
3069 for ( $i = 0; $i < $num_fields; $i++ ) {
3070 $this->col_info[ $i ] = mysqli_fetch_field( $this->result );
3071 }
3072 } else {
3073 $num_fields = mysql_num_fields( $this->result );
3074 for ( $i = 0; $i < $num_fields; $i++ ) {
3075 $this->col_info[ $i ] = mysql_fetch_field( $this->result, $i );
3076 }
3077 }
3078 }
3079
3080 /**
3081 * Retrieve column metadata from the last query.
3082 *
3083 * @since 0.71
3084 *
3085 * @param string $info_type Optional. Type one of name, table, def, max_length, not_null, primary_key, multiple_key, unique_key, numeric, blob, type, unsigned, zerofill
3086 * @param int $col_offset Optional. 0: col name. 1: which table the col's in. 2: col's max length. 3: if the col is numeric. 4: col's type
3087 * @return mixed Column Results
3088 */
3089 public function get_col_info( $info_type = 'name', $col_offset = -1 ) {
3090 $this->load_col_info();
3091
3092 if ( $this->col_info ) {
3093 if ( $col_offset == -1 ) {
3094 $i = 0;
3095 $new_array = array();
3096 foreach ( (array) $this->col_info as $col ) {
3097 $new_array[$i] = $col->{$info_type};
3098 $i++;
3099 }
3100 return $new_array;
3101 } else {
3102 return $this->col_info[$col_offset]->{$info_type};
3103 }
3104 }
3105 }
3106
3107 /**
3108 * Starts the timer, for debugging purposes.
3109 *
3110 * @since 1.5.0
3111 *
3112 * @return true
3113 */
3114 public function timer_start() {
3115 $this->time_start = microtime( true );
3116 return true;
3117 }
3118
3119 /**
3120 * Stops the debugging timer.
3121 *
3122 * @since 1.5.0
3123 *
3124 * @return float Total time spent on the query, in seconds
3125 */
3126 public function timer_stop() {
3127 return ( microtime( true ) - $this->time_start );
3128 }
3129
3130 /**
3131 * Wraps errors in a nice header and footer and dies.
3132 *
3133 * Will not die if wpdb::$show_errors is false.
3134 *
3135 * @since 1.5.0
3136 *
3137 * @param string $message The Error message
3138 * @param string $error_code Optional. A Computer readable string to identify the error.
3139 * @return false|void
3140 */
3141 public function bail( $message, $error_code = '500' ) {
3142 if ( !$this->show_errors ) {
3143 if ( class_exists( 'WP_Error', false ) ) {
3144 $this->error = new WP_Error($error_code, $message);
3145 } else {
3146 $this->error = $message;
3147 }
3148 return false;
3149 }
3150 wp_die($message);
3151 }
3152
3153
3154 /**
3155 * Closes the current database connection.
3156 *
3157 * @since 4.5.0
3158 * @access public
3159 *
3160 * @return bool True if the connection was successfully closed, false if it wasn't,
3161 * or the connection doesn't exist.
3162 */
3163 public function close() {
3164 if ( ! $this->dbh ) {
3165 return false;
3166 }
3167
3168 if ( $this->use_mysqli ) {
3169 $closed = mysqli_close( $this->dbh );
3170 } else {
3171 $closed = mysql_close( $this->dbh );
3172 }
3173
3174 if ( $closed ) {
3175 $this->dbh = null;
3176 $this->ready = false;
3177 $this->has_connected = false;
3178 }
3179
3180 return $closed;
3181 }
3182
3183 /**
3184 * Whether MySQL database is at least the required minimum version.
3185 *
3186 * @since 2.5.0
3187 *
3188 * @global string $wp_version
3189 * @global string $required_mysql_version
3190 *
3191 * @return WP_Error|void
3192 */
3193 public function check_database_version() {
3194 global $wp_version, $required_mysql_version;
3195 // Make sure the server has the required MySQL version
3196 if ( version_compare($this->db_version(), $required_mysql_version, '<') )
3197 return new WP_Error('database_version', sprintf( __( '<strong>ERROR</strong>: WordPress %1$s requires MySQL %2$s or higher' ), $wp_version, $required_mysql_version ));
3198 }
3199
3200 /**
3201 * Whether the database supports collation.
3202 *
3203 * Called when WordPress is generating the table scheme.
3204 *
3205 * Use `wpdb::has_cap( 'collation' )`.
3206 *
3207 * @since 2.5.0
3208 * @deprecated 3.5.0 Use wpdb::has_cap()
3209 *
3210 * @return bool True if collation is supported, false if version does not
3211 */
3212 public function supports_collation() {
3213 _deprecated_function( __FUNCTION__, '3.5.0', 'wpdb::has_cap( \'collation\' )' );
3214 return $this->has_cap( 'collation' );
3215 }
3216
3217 /**
3218 * The database character collate.
3219 *
3220 * @since 3.5.0
3221 *
3222 * @return string The database character collate.
3223 */
3224 public function get_charset_collate() {
3225 $charset_collate = '';
3226
3227 if ( ! empty( $this->charset ) )
3228 $charset_collate = "DEFAULT CHARACTER SET $this->charset";
3229 if ( ! empty( $this->collate ) )
3230 $charset_collate .= " COLLATE $this->collate";
3231
3232 return $charset_collate;
3233 }
3234
3235 /**
3236 * Determine if a database supports a particular feature.
3237 *
3238 * @since 2.7.0
3239 * @since 4.1.0 Added support for the 'utf8mb4' feature.
3240 * @since 4.6.0 Added support for the 'utf8mb4_520' feature.
3241 *
3242 * @see wpdb::db_version()
3243 *
3244 * @param string $db_cap The feature to check for. Accepts 'collation',
3245 * 'group_concat', 'subqueries', 'set_charset',
3246 * or 'utf8mb4'.
3247 * @return int|false Whether the database feature is supported, false otherwise.
3248 */
3249 public function has_cap( $db_cap ) {
3250 $version = $this->db_version();
3251
3252 switch ( strtolower( $db_cap ) ) {
3253 case 'collation' : // @since 2.5.0
3254 case 'group_concat' : // @since 2.7.0
3255 case 'subqueries' : // @since 2.7.0
3256 return version_compare( $version, '4.1', '>=' );
3257 case 'set_charset' :
3258 return version_compare( $version, '5.0.7', '>=' );
3259 case 'utf8mb4' : // @since 4.1.0
3260 if ( version_compare( $version, '5.5.3', '<' ) ) {
3261 return false;
3262 }
3263 if ( $this->use_mysqli ) {
3264 $client_version = mysqli_get_client_info();
3265 } else {
3266 $client_version = mysql_get_client_info();
3267 }
3268
3269 /*
3270 * libmysql has supported utf8mb4 since 5.5.3, same as the MySQL server.
3271 * mysqlnd has supported utf8mb4 since 5.0.9.
3272 */
3273 if ( false !== strpos( $client_version, 'mysqlnd' ) ) {
3274 $client_version = preg_replace( '/^\D+([\d.]+).*/', '$1', $client_version );
3275 return version_compare( $client_version, '5.0.9', '>=' );
3276 } else {
3277 return version_compare( $client_version, '5.5.3', '>=' );
3278 }
3279 case 'utf8mb4_520' : // @since 4.6.0
3280 return version_compare( $version, '5.6', '>=' );
3281 }
3282
3283 return false;
3284 }
3285
3286 /**
3287 * Retrieve the name of the function that called wpdb.
3288 *
3289 * Searches up the list of functions until it reaches
3290 * the one that would most logically had called this method.
3291 *
3292 * @since 2.5.0
3293 *
3294 * @return string|array The name of the calling function
3295 */
3296 public function get_caller() {
3297 return wp_debug_backtrace_summary( __CLASS__ );
3298 }
3299
3300 /**
3301 * Retrieves the MySQL server version.
3302 *
3303 * @since 2.7.0
3304 *
3305 * @return null|string Null on failure, version number on success.
3306 */
3307 public function db_version() {
3308 if ( $this->use_mysqli ) {
3309 $server_info = mysqli_get_server_info( $this->dbh );
3310 } else {
3311 $server_info = mysql_get_server_info( $this->dbh );
3312 }
3313 return preg_replace( '/[^0-9.].*/', '', $server_info );
3314 }
3315}