0KAhZD6H

1<?php
2/**
3 * These functions can be replaced via plugins. If plugins do not redefine these
4 * functions, then these will be used instead.
5 *
6 * @package WordPress
7 */
8
9if ( !function_exists('wp_set_current_user') ) :
10/**
11 * Changes the current user by ID or name.
12 *
13 * Set $id to null and specify a name if you do not know a user's ID.
14 *
15 * Some WordPress functionality is based on the current user and not based on
16 * the signed in user. Therefore, it opens the ability to edit and perform
17 * actions on users who aren't signed in.
18 *
19 * @since 2.0.3
20 * @global WP_User $current_user The current user object which holds the user data.
21 *
22 * @param int    $id   User ID
23 * @param string $name User's username
24 * @return WP_User Current user User object
25 */
26function wp_set_current_user($id, $name = '') {
27	global $current_user;
28
29	// If `$id` matches the user who's already current, there's nothing to do.
30	if ( isset( $current_user )
31		&& ( $current_user instanceof WP_User )
32		&& ( $id == $current_user->ID )
33		&& ( null !== $id )
34	) {
35		return $current_user;
36	}
37
38	$current_user = new WP_User( $id, $name );
39
40	setup_userdata( $current_user->ID );
41
42	/**
43	 * Fires after the current user is set.
44	 *
45	 * @since 2.0.1
46	 */
47	do_action( 'set_current_user' );
48
49	return $current_user;
50}
51endif;
52
53if ( !function_exists('wp_get_current_user') ) :
54/**
55 * Retrieve the current user object.
56 *
57 * Will set the current user, if the current user is not set. The current user
58 * will be set to the logged-in person. If no user is logged-in, then it will
59 * set the current user to 0, which is invalid and won't have any permissions.
60 *
61 * @since 2.0.3
62 *
63 * @see _wp_get_current_user()
64 * @global WP_User $current_user Checks if the current user is set.
65 *
66 * @return WP_User Current WP_User instance.
67 */
68function wp_get_current_user() {
69	return _wp_get_current_user();
70}
71endif;
72
73if ( !function_exists('get_userdata') ) :
74/**
75 * Retrieve user info by user ID.
76 *
77 * @since 0.71
78 *
79 * @param int $user_id User ID
80 * @return WP_User|false WP_User object on success, false on failure.
81 */
82function get_userdata( $user_id ) {
83	return get_user_by( 'id', $user_id );
84}
85endif;
86
87if ( !function_exists('get_user_by') ) :
88/**
89 * Retrieve user info by a given field
90 *
91 * @since 2.8.0
92 * @since 4.4.0 Added 'ID' as an alias of 'id' for the `$field` parameter.
93 *
94 * @param string     $field The field to retrieve the user with. id | ID | slug | email | login.
95 * @param int|string $value A value for $field. A user ID, slug, email address, or login name.
96 * @return WP_User|false WP_User object on success, false on failure.
97 */
98function get_user_by( $field, $value ) {
99	$userdata = WP_User::get_data_by( $field, $value );
100
101	if ( !$userdata )
102		return false;
103
104	$user = new WP_User;
105	$user->init( $userdata );
106
107	return $user;
108}
109endif;
110
111if ( !function_exists('cache_users') ) :
112/**
113 * Retrieve info for user lists to prevent multiple queries by get_userdata()
114 *
115 * @since 3.0.0
116 *
117 * @global wpdb $wpdb WordPress database abstraction object.
118 *
119 * @param array $user_ids User ID numbers list
120 */
121function cache_users( $user_ids ) {
122	global $wpdb;
123
124	$clean = _get_non_cached_ids( $user_ids, 'users' );
125
126	if ( empty( $clean ) )
127		return;
128
129	$list = implode( ',', $clean );
130
131	$users = $wpdb->get_results( "SELECT * FROM $wpdb->users WHERE ID IN ($list)" );
132
133	$ids = array();
134	foreach ( $users as $user ) {
135		update_user_caches( $user );
136		$ids[] = $user->ID;
137	}
138	update_meta_cache( 'user', $ids );
139}
140endif;
141
142if ( !function_exists( 'wp_mail' ) ) :
143/**
144 * Send mail, similar to PHP's mail
145 *
146 * A true return value does not automatically mean that the user received the
147 * email successfully. It just only means that the method used was able to
148 * process the request without any errors.
149 *
150 * Using the two 'wp_mail_from' and 'wp_mail_from_name' hooks allow from
151 * creating a from address like 'Name <email@address.com>' when both are set. If
152 * just 'wp_mail_from' is set, then just the email address will be used with no
153 * name.
154 *
155 * The default content type is 'text/plain' which does not allow using HTML.
156 * However, you can set the content type of the email by using the
157 * {@see 'wp_mail_content_type'} filter.
158 *
159 * The default charset is based on the charset used on the blog. The charset can
160 * be set using the {@see 'wp_mail_charset'} filter.
161 *
162 * @since 1.2.1
163 *
164 * @global PHPMailer $phpmailer
165 *
166 * @param string|array $to          Array or comma-separated list of email addresses to send message.
167 * @param string       $subject     Email subject
168 * @param string       $message     Message contents
169 * @param string|array $headers     Optional. Additional headers.
170 * @param string|array $attachments Optional. Files to attach.
171 * @return bool Whether the email contents were sent successfully.
172 */
173function wp_mail( $to, $subject, $message, $headers = '', $attachments = array() ) {
174	// Compact the input, apply the filters, and extract them back out
175
176	/**
177	 * Filters the wp_mail() arguments.
178	 *
179	 * @since 2.2.0
180	 *
181	 * @param array $args A compacted array of wp_mail() arguments, including the "to" email,
182	 *                    subject, message, headers, and attachments values.
183	 */
184	$atts = apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers', 'attachments' ) );
185
186	if ( isset( $atts['to'] ) ) {
187		$to = $atts['to'];
188	}
189
190	if ( isset( $atts['subject'] ) ) {
191		$subject = $atts['subject'];
192	}
193
194	if ( isset( $atts['message'] ) ) {
195		$message = $atts['message'];
196	}
197
198	if ( isset( $atts['headers'] ) ) {
199		$headers = $atts['headers'];
200	}
201
202	if ( isset( $atts['attachments'] ) ) {
203		$attachments = $atts['attachments'];
204	}
205
206	if ( ! is_array( $attachments ) ) {
207		$attachments = explode( "\n", str_replace( "\r\n", "\n", $attachments ) );
208	}
209	global $phpmailer;
210
211	// (Re)create it, if it's gone missing
212	if ( ! ( $phpmailer instanceof PHPMailer ) ) {
213		require_once ABSPATH . WPINC . '/class-phpmailer.php';
214		require_once ABSPATH . WPINC . '/class-smtp.php';
215		$phpmailer = new PHPMailer( true );
216	}
217
218	// Headers
219	$cc = $bcc = $reply_to = array();
220
221	if ( empty( $headers ) ) {
222		$headers = array();
223	} else {
224		if ( !is_array( $headers ) ) {
225			// Explode the headers out, so this function can take both
226			// string headers and an array of headers.
227			$tempheaders = explode( "\n", str_replace( "\r\n", "\n", $headers ) );
228		} else {
229			$tempheaders = $headers;
230		}
231		$headers = array();
232
233		// If it's actually got contents
234		if ( !empty( $tempheaders ) ) {
235			// Iterate through the raw headers
236			foreach ( (array) $tempheaders as $header ) {
237				if ( strpos($header, ':') === false ) {
238					if ( false !== stripos( $header, 'boundary=' ) ) {
239						$parts = preg_split('/boundary=/i', trim( $header ) );
240						$boundary = trim( str_replace( array( "'", '"' ), '', $parts[1] ) );
241					}
242					continue;
243				}
244				// Explode them out
245				list( $name, $content ) = explode( ':', trim( $header ), 2 );
246
247				// Cleanup crew
248				$name    = trim( $name    );
249				$content = trim( $content );
250
251				switch ( strtolower( $name ) ) {
252					// Mainly for legacy -- process a From: header if it's there
253					case 'from':
254						$bracket_pos = strpos( $content, '<' );
255						if ( $bracket_pos !== false ) {
256							// Text before the bracketed email is the "From" name.
257							if ( $bracket_pos > 0 ) {
258								$from_name = substr( $content, 0, $bracket_pos - 1 );
259								$from_name = str_replace( '"', '', $from_name );
260								$from_name = trim( $from_name );
261							}
262
263							$from_email = substr( $content, $bracket_pos + 1 );
264							$from_email = str_replace( '>', '', $from_email );
265							$from_email = trim( $from_email );
266
267						// Avoid setting an empty $from_email.
268						} elseif ( '' !== trim( $content ) ) {
269							$from_email = trim( $content );
270						}
271						break;
272					case 'content-type':
273						if ( strpos( $content, ';' ) !== false ) {
274							list( $type, $charset_content ) = explode( ';', $content );
275							$content_type = trim( $type );
276							if ( false !== stripos( $charset_content, 'charset=' ) ) {
277								$charset = trim( str_replace( array( 'charset=', '"' ), '', $charset_content ) );
278							} elseif ( false !== stripos( $charset_content, 'boundary=' ) ) {
279								$boundary = trim( str_replace( array( 'BOUNDARY=', 'boundary=', '"' ), '', $charset_content ) );
280								$charset = '';
281							}
282
283						// Avoid setting an empty $content_type.
284						} elseif ( '' !== trim( $content ) ) {
285							$content_type = trim( $content );
286						}
287						break;
288					case 'cc':
289						$cc = array_merge( (array) $cc, explode( ',', $content ) );
290						break;
291					case 'bcc':
292						$bcc = array_merge( (array) $bcc, explode( ',', $content ) );
293						break;
294					case 'reply-to':
295						$reply_to = array_merge( (array) $reply_to, explode( ',', $content ) );
296						break;
297					default:
298						// Add it to our grand headers array
299						$headers[trim( $name )] = trim( $content );
300						break;
301				}
302			}
303		}
304	}
305
306	// Empty out the values that may be set
307	$phpmailer->ClearAllRecipients();
308	$phpmailer->ClearAttachments();
309	$phpmailer->ClearCustomHeaders();
310	$phpmailer->ClearReplyTos();
311
312	// From email and name
313	// If we don't have a name from the input headers
314	if ( !isset( $from_name ) )
315		$from_name = 'WordPress';
316
317	/* If we don't have an email from the input headers default to wordpress@$sitename
318	 * Some hosts will block outgoing mail from this address if it doesn't exist but
319	 * there's no easy alternative. Defaulting to admin_email might appear to be another
320	 * option but some hosts may refuse to relay mail from an unknown domain. See
321	 * https://core.trac.wordpress.org/ticket/5007.
322	 */
323
324	if ( !isset( $from_email ) ) {
325		// Get the site domain and get rid of www.
326		$sitename = strtolower( $_SERVER['SERVER_NAME'] );
327		if ( substr( $sitename, 0, 4 ) == 'www.' ) {
328			$sitename = substr( $sitename, 4 );
329		}
330
331		$from_email = 'wordpress@' . $sitename;
332	}
333
334	/**
335	 * Filters the email address to send from.
336	 *
337	 * @since 2.2.0
338	 *
339	 * @param string $from_email Email address to send from.
340	 */
341	$from_email = apply_filters( 'wp_mail_from', $from_email );
342
343	/**
344	 * Filters the name to associate with the "from" email address.
345	 *
346	 * @since 2.3.0
347	 *
348	 * @param string $from_name Name associated with the "from" email address.
349	 */
350	$from_name = apply_filters( 'wp_mail_from_name', $from_name );
351
352	$phpmailer->setFrom( $from_email, $from_name, false );
353
354	// Set destination addresses
355	if ( !is_array( $to ) )
356		$to = explode( ',', $to );
357
358	// Set mail's subject and body
359	$phpmailer->Subject = $subject;
360	$phpmailer->Body    = $message;
361
362	// Use appropriate methods for handling addresses, rather than treating them as generic headers
363	$address_headers = compact( 'to', 'cc', 'bcc', 'reply_to' );
364
365	foreach ( $address_headers as $address_header => $addresses ) {
366		if ( empty( $addresses ) ) {
367			continue;
368		}
369
370		foreach ( (array) $addresses as $address ) {
371			try {
372				// Break $recipient into name and address parts if in the format "Foo <bar@baz.com>"
373				$recipient_name = '';
374
375				if ( preg_match( '/(.*)<(.+)>/', $address, $matches ) ) {
376					if ( count( $matches ) == 3 ) {
377						$recipient_name = $matches[1];
378						$address        = $matches[2];
379					}
380				}
381
382				switch ( $address_header ) {
383					case 'to':
384						$phpmailer->addAddress( $address, $recipient_name );
385						break;
386					case 'cc':
387						$phpmailer->addCc( $address, $recipient_name );
388						break;
389					case 'bcc':
390						$phpmailer->addBcc( $address, $recipient_name );
391						break;
392					case 'reply_to':
393						$phpmailer->addReplyTo( $address, $recipient_name );
394						break;
395				}
396			} catch ( phpmailerException $e ) {
397				continue;
398			}
399		}
400	}
401
402	// Set to use PHP's mail()
403	$phpmailer->IsMail();
404
405	// Set Content-Type and charset
406	// If we don't have a content-type from the input headers
407	if ( !isset( $content_type ) )
408		$content_type = 'text/plain';
409
410	/**
411	 * Filters the wp_mail() content type.
412	 *
413	 * @since 2.3.0
414	 *
415	 * @param string $content_type Default wp_mail() content type.
416	 */
417	$content_type = apply_filters( 'wp_mail_content_type', $content_type );
418
419	$phpmailer->ContentType = $content_type;
420
421	// Set whether it's plaintext, depending on $content_type
422	if ( 'text/html' == $content_type )
423		$phpmailer->IsHTML( true );
424
425	// If we don't have a charset from the input headers
426	if ( !isset( $charset ) )
427		$charset = get_bloginfo( 'charset' );
428
429	// Set the content-type and charset
430
431	/**
432	 * Filters the default wp_mail() charset.
433	 *
434	 * @since 2.3.0
435	 *
436	 * @param string $charset Default email charset.
437	 */
438	$phpmailer->CharSet = apply_filters( 'wp_mail_charset', $charset );
439
440	// Set custom headers
441	if ( !empty( $headers ) ) {
442		foreach ( (array) $headers as $name => $content ) {
443			$phpmailer->AddCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) );
444		}
445
446		if ( false !== stripos( $content_type, 'multipart' ) && ! empty($boundary) )
447			$phpmailer->AddCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) );
448	}
449
450	if ( !empty( $attachments ) ) {
451		foreach ( $attachments as $attachment ) {
452			try {
453				$phpmailer->AddAttachment($attachment);
454			} catch ( phpmailerException $e ) {
455				continue;
456			}
457		}
458	}
459
460	/**
461	 * Fires after PHPMailer is initialized.
462	 *
463	 * @since 2.2.0
464	 *
465	 * @param PHPMailer &$phpmailer The PHPMailer instance, passed by reference.
466	 */
467	do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) );
468
469	// Send!
470	try {
471		return $phpmailer->Send();
472	} catch ( phpmailerException $e ) {
473
474		$mail_error_data = compact( 'to', 'subject', 'message', 'headers', 'attachments' );
475		$mail_error_data['phpmailer_exception_code'] = $e->getCode();
476
477		/**
478		 * Fires after a phpmailerException is caught.
479		 *
480		 * @since 4.4.0
481		 *
482		 * @param WP_Error $error A WP_Error object with the phpmailerException message, and an array
483		 *                        containing the mail recipient, subject, message, headers, and attachments.
484		 */
485		do_action( 'wp_mail_failed', new WP_Error( 'wp_mail_failed', $e->getMessage(), $mail_error_data ) );
486
487		return false;
488	}
489}
490endif;
491
492if ( !function_exists('wp_authenticate') ) :
493/**
494 * Authenticate a user, confirming the login credentials are valid.
495 *
496 * @since 2.5.0
497 * @since 4.5.0 `$username` now accepts an email address.
498 *
499 * @param string $username User's username or email address.
500 * @param string $password User's password.
501 * @return WP_User|WP_Error WP_User object if the credentials are valid,
502 *                          otherwise WP_Error.
503 */
504function wp_authenticate($username, $password) {
505	$username = sanitize_user($username);
506	$password = trim($password);
507
508	/**
509	 * Filters whether a set of user login credentials are valid.
510	 *
511	 * A WP_User object is returned if the credentials authenticate a user.
512	 * WP_Error or null otherwise.
513	 *
514	 * @since 2.8.0
515	 * @since 4.5.0 `$username` now accepts an email address.
516	 *
517	 * @param null|WP_User|WP_Error $user     WP_User if the user is authenticated.
518	 *                                        WP_Error or null otherwise.
519	 * @param string                $username Username or email address.
520	 * @param string                $password User password
521	 */
522	$user = apply_filters( 'authenticate', null, $username, $password );
523
524	if ( $user == null ) {
525		// TODO what should the error message be? (Or would these even happen?)
526		// Only needed if all authentication handlers fail to return anything.
527		$user = new WP_Error( 'authentication_failed', __( '<strong>ERROR</strong>: Invalid username, email address or incorrect password.' ) );
528	}
529
530	$ignore_codes = array('empty_username', 'empty_password');
531
532	if (is_wp_error($user) && !in_array($user->get_error_code(), $ignore_codes) ) {
533		/**
534		 * Fires after a user login has failed.
535		 *
536		 * @since 2.5.0
537		 * @since 4.5.0 The value of `$username` can now be an email address.
538		 *
539		 * @param string $username Username or email address.
540		 */
541		do_action( 'wp_login_failed', $username );
542	}
543
544	return $user;
545}
546endif;
547
548if ( !function_exists('wp_logout') ) :
549/**
550 * Log the current user out.
551 *
552 * @since 2.5.0
553 */
554function wp_logout() {
555	wp_destroy_current_session();
556	wp_clear_auth_cookie();
557
558	/**
559	 * Fires after a user is logged-out.
560	 *
561	 * @since 1.5.0
562	 */
563	do_action( 'wp_logout' );
564}
565endif;
566
567if ( !function_exists('wp_validate_auth_cookie') ) :
568/**
569 * Validates authentication cookie.
570 *
571 * The checks include making sure that the authentication cookie is set and
572 * pulling in the contents (if $cookie is not used).
573 *
574 * Makes sure the cookie is not expired. Verifies the hash in cookie is what is
575 * should be and compares the two.
576 *
577 * @since 2.5.0
578 *
579 * @global int $login_grace_period
580 *
581 * @param string $cookie Optional. If used, will validate contents instead of cookie's
582 * @param string $scheme Optional. The cookie scheme to use: auth, secure_auth, or logged_in
583 * @return false|int False if invalid cookie, User ID if valid.
584 */
585function wp_validate_auth_cookie($cookie = '', $scheme = '') {
586	if ( ! $cookie_elements = wp_parse_auth_cookie($cookie, $scheme) ) {
587		/**
588		 * Fires if an authentication cookie is malformed.
589		 *
590		 * @since 2.7.0
591		 *
592		 * @param string $cookie Malformed auth cookie.
593		 * @param string $scheme Authentication scheme. Values include 'auth', 'secure_auth',
594		 *                       or 'logged_in'.
595		 */
596		do_action( 'auth_cookie_malformed', $cookie, $scheme );
597		return false;
598	}
599
600	$scheme = $cookie_elements['scheme'];
601	$username = $cookie_elements['username'];
602	$hmac = $cookie_elements['hmac'];
603	$token = $cookie_elements['token'];
604	$expired = $expiration = $cookie_elements['expiration'];
605
606	// Allow a grace period for POST and Ajax requests
607	if ( wp_doing_ajax() || 'POST' == $_SERVER['REQUEST_METHOD'] ) {
608		$expired += HOUR_IN_SECONDS;
609	}
610
611	// Quick check to see if an honest cookie has expired
612	if ( $expired < time() ) {
613		/**
614		 * Fires once an authentication cookie has expired.
615		 *
616		 * @since 2.7.0
617		 *
618		 * @param array $cookie_elements An array of data for the authentication cookie.
619		 */
620		do_action( 'auth_cookie_expired', $cookie_elements );
621		return false;
622	}
623
624	$user = get_user_by('login', $username);
625	if ( ! $user ) {
626		/**
627		 * Fires if a bad username is entered in the user authentication process.
628		 *
629		 * @since 2.7.0
630		 *
631		 * @param array $cookie_elements An array of data for the authentication cookie.
632		 */
633		do_action( 'auth_cookie_bad_username', $cookie_elements );
634		return false;
635	}
636
637	$pass_frag = substr($user->user_pass, 8, 4);
638
639	$key = wp_hash( $username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme );
640
641	// If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
642	$algo = function_exists( 'hash' ) ? 'sha256' : 'sha1';
643	$hash = hash_hmac( $algo, $username . '|' . $expiration . '|' . $token, $key );
644
645	if ( ! hash_equals( $hash, $hmac ) ) {
646		/**
647		 * Fires if a bad authentication cookie hash is encountered.
648		 *
649		 * @since 2.7.0
650		 *
651		 * @param array $cookie_elements An array of data for the authentication cookie.
652		 */
653		do_action( 'auth_cookie_bad_hash', $cookie_elements );
654		return false;
655	}
656
657	$manager = WP_Session_Tokens::get_instance( $user->ID );
658	if ( ! $manager->verify( $token ) ) {
659		do_action( 'auth_cookie_bad_session_token', $cookie_elements );
660		return false;
661	}
662
663	// Ajax/POST grace period set above
664	if ( $expiration < time() ) {
665		$GLOBALS['login_grace_period'] = 1;
666	}
667
668	/**
669	 * Fires once an authentication cookie has been validated.
670	 *
671	 * @since 2.7.0
672	 *
673	 * @param array   $cookie_elements An array of data for the authentication cookie.
674	 * @param WP_User $user            User object.
675	 */
676	do_action( 'auth_cookie_valid', $cookie_elements, $user );
677
678	return $user->ID;
679}
680endif;
681
682if ( !function_exists('wp_generate_auth_cookie') ) :
683/**
684 * Generate authentication cookie contents.
685 *
686 * @since 2.5.0
687 *
688 * @param int    $user_id    User ID
689 * @param int    $expiration The time the cookie expires as a UNIX timestamp.
690 * @param string $scheme     Optional. The cookie scheme to use: auth, secure_auth, or logged_in
691 * @param string $token      User's session token to use for this cookie
692 * @return string Authentication cookie contents. Empty string if user does not exist.
693 */
694function wp_generate_auth_cookie( $user_id, $expiration, $scheme = 'auth', $token = '' ) {
695	$user = get_userdata($user_id);
696	if ( ! $user ) {
697		return '';
698	}
699
700	if ( ! $token ) {
701		$manager = WP_Session_Tokens::get_instance( $user_id );
702		$token = $manager->create( $expiration );
703	}
704
705	$pass_frag = substr($user->user_pass, 8, 4);
706
707	$key = wp_hash( $user->user_login . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme );
708
709	// If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
710	$algo = function_exists( 'hash' ) ? 'sha256' : 'sha1';
711	$hash = hash_hmac( $algo, $user->user_login . '|' . $expiration . '|' . $token, $key );
712
713	$cookie = $user->user_login . '|' . $expiration . '|' . $token . '|' . $hash;
714
715	/**
716	 * Filters the authentication cookie.
717	 *
718	 * @since 2.5.0
719	 *
720	 * @param string $cookie     Authentication cookie.
721	 * @param int    $user_id    User ID.
722	 * @param int    $expiration The time the cookie expires as a UNIX timestamp.
723	 * @param string $scheme     Cookie scheme used. Accepts 'auth', 'secure_auth', or 'logged_in'.
724	 * @param string $token      User's session token used.
725	 */
726	return apply_filters( 'auth_cookie', $cookie, $user_id, $expiration, $scheme, $token );
727}
728endif;
729
730if ( !function_exists('wp_parse_auth_cookie') ) :
731/**
732 * Parse a cookie into its components
733 *
734 * @since 2.7.0
735 *
736 * @param string $cookie
737 * @param string $scheme Optional. The cookie scheme to use: auth, secure_auth, or logged_in
738 * @return array|false Authentication cookie components
739 */
740function wp_parse_auth_cookie($cookie = '', $scheme = '') {
741	if ( empty($cookie) ) {
742		switch ($scheme){
743			case 'auth':
744				$cookie_name = AUTH_COOKIE;
745				break;
746			case 'secure_auth':
747				$cookie_name = SECURE_AUTH_COOKIE;
748				break;
749			case "logged_in":
750				$cookie_name = LOGGED_IN_COOKIE;
751				break;
752			default:
753				if ( is_ssl() ) {
754					$cookie_name = SECURE_AUTH_COOKIE;
755					$scheme = 'secure_auth';
756				} else {
757					$cookie_name = AUTH_COOKIE;
758					$scheme = 'auth';
759				}
760	    }
761
762		if ( empty($_COOKIE[$cookie_name]) )
763			return false;
764		$cookie = $_COOKIE[$cookie_name];
765	}
766
767	$cookie_elements = explode('|', $cookie);
768	if ( count( $cookie_elements ) !== 4 ) {
769		return false;
770	}
771
772	list( $username, $expiration, $token, $hmac ) = $cookie_elements;
773
774	return compact( 'username', 'expiration', 'token', 'hmac', 'scheme' );
775}
776endif;
777
778if ( !function_exists('wp_set_auth_cookie') ) :
779/**
780 * Log in a user by setting authentication cookies.
781 *
782 * The $remember parameter increases the time that the cookie will be kept. The
783 * default the cookie is kept without remembering is two days. When $remember is
784 * set, the cookies will be kept for 14 days or two weeks.
785 *
786 * @since 2.5.0
787 * @since 4.3.0 Added the `$token` parameter.
788 *
789 * @param int    $user_id  User ID
790 * @param bool   $remember Whether to remember the user
791 * @param mixed  $secure   Whether the admin cookies should only be sent over HTTPS.
792 *                         Default is_ssl().
793 * @param string $token    Optional. User's session token to use for this cookie.
794 */
795function wp_set_auth_cookie( $user_id, $remember = false, $secure = '', $token = '' ) {
796	if ( $remember ) {
797		/**
798		 * Filters the duration of the authentication cookie expiration period.
799		 *
800		 * @since 2.8.0
801		 *
802		 * @param int  $length   Duration of the expiration period in seconds.
803		 * @param int  $user_id  User ID.
804		 * @param bool $remember Whether to remember the user login. Default false.
805		 */
806		$expiration = time() + apply_filters( 'auth_cookie_expiration', 14 * DAY_IN_SECONDS, $user_id, $remember );
807
808		/*
809		 * Ensure the browser will continue to send the cookie after the expiration time is reached.
810		 * Needed for the login grace period in wp_validate_auth_cookie().
811		 */
812		$expire = $expiration + ( 12 * HOUR_IN_SECONDS );
813	} else {
814		/** This filter is documented in wp-includes/pluggable.php */
815		$expiration = time() + apply_filters( 'auth_cookie_expiration', 2 * DAY_IN_SECONDS, $user_id, $remember );
816		$expire = 0;
817	}
818
819	if ( '' === $secure ) {
820		$secure = is_ssl();
821	}
822
823	// Front-end cookie is secure when the auth cookie is secure and the site's home URL is forced HTTPS.
824	$secure_logged_in_cookie = $secure && 'https' === parse_url( get_option( 'home' ), PHP_URL_SCHEME );
825
826	/**
827	 * Filters whether the connection is secure.
828	 *
829	 * @since 3.1.0
830	 *
831	 * @param bool $secure  Whether the connection is secure.
832	 * @param int  $user_id User ID.
833	 */
834	$secure = apply_filters( 'secure_auth_cookie', $secure, $user_id );
835
836	/**
837	 * Filters whether to use a secure cookie when logged-in.
838	 *
839	 * @since 3.1.0
840	 *
841	 * @param bool $secure_logged_in_cookie Whether to use a secure cookie when logged-in.
842	 * @param int  $user_id                 User ID.
843	 * @param bool $secure                  Whether the connection is secure.
844	 */
845	$secure_logged_in_cookie = apply_filters( 'secure_logged_in_cookie', $secure_logged_in_cookie, $user_id, $secure );
846
847	if ( $secure ) {
848		$auth_cookie_name = SECURE_AUTH_COOKIE;
849		$scheme = 'secure_auth';
850	} else {
851		$auth_cookie_name = AUTH_COOKIE;
852		$scheme = 'auth';
853	}
854
855	if ( '' === $token ) {
856		$manager = WP_Session_Tokens::get_instance( $user_id );
857		$token   = $manager->create( $expiration );
858	}
859
860	$auth_cookie = wp_generate_auth_cookie( $user_id, $expiration, $scheme, $token );
861	$logged_in_cookie = wp_generate_auth_cookie( $user_id, $expiration, 'logged_in', $token );
862
863	/**
864	 * Fires immediately before the authentication cookie is set.
865	 *
866	 * @since 2.5.0
867	 *
868	 * @param string $auth_cookie Authentication cookie.
869	 * @param int    $expire      The time the login grace period expires as a UNIX timestamp.
870	 *                            Default is 12 hours past the cookie's expiration time.
871	 * @param int    $expiration  The time when the authentication cookie expires as a UNIX timestamp.
872	 *                            Default is 14 days from now.
873	 * @param int    $user_id     User ID.
874	 * @param string $scheme      Authentication scheme. Values include 'auth', 'secure_auth', or 'logged_in'.
875	 */
876	do_action( 'set_auth_cookie', $auth_cookie, $expire, $expiration, $user_id, $scheme );
877
878	/**
879	 * Fires immediately before the logged-in authentication cookie is set.
880	 *
881	 * @since 2.6.0
882	 *
883	 * @param string $logged_in_cookie The logged-in cookie.
884	 * @param int    $expire           The time the login grace period expires as a UNIX timestamp.
885	 *                                 Default is 12 hours past the cookie's expiration time.
886	 * @param int    $expiration       The time when the logged-in authentication cookie expires as a UNIX timestamp.
887	 *                                 Default is 14 days from now.
888	 * @param int    $user_id          User ID.
889	 * @param string $scheme           Authentication scheme. Default 'logged_in'.
890	 */
891	do_action( 'set_logged_in_cookie', $logged_in_cookie, $expire, $expiration, $user_id, 'logged_in' );
892
893	setcookie($auth_cookie_name, $auth_cookie, $expire, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN, $secure, true);
894	setcookie($auth_cookie_name, $auth_cookie, $expire, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, $secure, true);
895	setcookie(LOGGED_IN_COOKIE, $logged_in_cookie, $expire, COOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true);
896	if ( COOKIEPATH != SITECOOKIEPATH )
897		setcookie(LOGGED_IN_COOKIE, $logged_in_cookie, $expire, SITECOOKIEPATH, COOKIE_DOMAIN, $secure_logged_in_cookie, true);
898}
899endif;
900
901if ( !function_exists('wp_clear_auth_cookie') ) :
902/**
903 * Removes all of the cookies associated with authentication.
904 *
905 * @since 2.5.0
906 */
907function wp_clear_auth_cookie() {
908	/**
909	 * Fires just before the authentication cookies are cleared.
910	 *
911	 * @since 2.7.0
912	 */
913	do_action( 'clear_auth_cookie' );
914
915	setcookie( AUTH_COOKIE,        ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH,   COOKIE_DOMAIN );
916	setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, ADMIN_COOKIE_PATH,   COOKIE_DOMAIN );
917	setcookie( AUTH_COOKIE,        ' ', time() - YEAR_IN_SECONDS, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN );
918	setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, PLUGINS_COOKIE_PATH, COOKIE_DOMAIN );
919	setcookie( LOGGED_IN_COOKIE,   ' ', time() - YEAR_IN_SECONDS, COOKIEPATH,          COOKIE_DOMAIN );
920	setcookie( LOGGED_IN_COOKIE,   ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH,      COOKIE_DOMAIN );
921
922	// Old cookies
923	setcookie( AUTH_COOKIE,        ' ', time() - YEAR_IN_SECONDS, COOKIEPATH,     COOKIE_DOMAIN );
924	setcookie( AUTH_COOKIE,        ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
925	setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH,     COOKIE_DOMAIN );
926	setcookie( SECURE_AUTH_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
927
928	// Even older cookies
929	setcookie( USER_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH,     COOKIE_DOMAIN );
930	setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, COOKIEPATH,     COOKIE_DOMAIN );
931	setcookie( USER_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
932	setcookie( PASS_COOKIE, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH, COOKIE_DOMAIN );
933}
934endif;
935
936if ( !function_exists('is_user_logged_in') ) :
937/**
938 * Checks if the current visitor is a logged in user.
939 *
940 * @since 2.0.0
941 *
942 * @return bool True if user is logged in, false if not logged in.
943 */
944function is_user_logged_in() {
945	$user = wp_get_current_user();
946
947	return $user->exists();
948}
949endif;
950
951if ( !function_exists('auth_redirect') ) :
952/**
953 * Checks if a user is logged in, if not it redirects them to the login page.
954 *
955 * @since 1.5.0
956 */
957function auth_redirect() {
958	// Checks if a user is logged in, if not redirects them to the login page
959
960	$secure = ( is_ssl() || force_ssl_admin() );
961
962	/**
963	 * Filters whether to use a secure authentication redirect.
964	 *
965	 * @since 3.1.0
966	 *
967	 * @param bool $secure Whether to use a secure authentication redirect. Default false.
968	 */
969	$secure = apply_filters( 'secure_auth_redirect', $secure );
970
971	// If https is required and request is http, redirect
972	if ( $secure && !is_ssl() && false !== strpos($_SERVER['REQUEST_URI'], 'wp-admin') ) {
973		if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
974			wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) );
975			exit();
976		} else {
977			wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
978			exit();
979		}
980	}
981
982	/**
983	 * Filters the authentication redirect scheme.
984	 *
985	 * @since 2.9.0
986	 *
987	 * @param string $scheme Authentication redirect scheme. Default empty.
988	 */
989	$scheme = apply_filters( 'auth_redirect_scheme', '' );
990
991	if ( $user_id = wp_validate_auth_cookie( '',  $scheme) ) {
992		/**
993		 * Fires before the authentication redirect.
994		 *
995		 * @since 2.8.0
996		 *
997		 * @param int $user_id User ID.
998		 */
999		do_action( 'auth_redirect', $user_id );
1000
1001		// If the user wants ssl but the session is not ssl, redirect.
1002		if ( !$secure && get_user_option('use_ssl', $user_id) && false !== strpos($_SERVER['REQUEST_URI'], 'wp-admin') ) {
1003			if ( 0 === strpos( $_SERVER['REQUEST_URI'], 'http' ) ) {
1004				wp_redirect( set_url_scheme( $_SERVER['REQUEST_URI'], 'https' ) );
1005				exit();
1006			} else {
1007				wp_redirect( 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
1008				exit();
1009			}
1010		}
1011
1012		return;  // The cookie is good so we're done
1013	}
1014
1015	// The cookie is no good so force login
1016	nocache_headers();
1017
1018	$redirect = ( strpos( $_SERVER['REQUEST_URI'], '/options.php' ) && wp_get_referer() ) ? wp_get_referer() : set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'] );
1019
1020	$login_url = wp_login_url($redirect, true);
1021
1022	wp_redirect($login_url);
1023	exit();
1024}
1025endif;
1026
1027if ( !function_exists('check_admin_referer') ) :
1028/**
1029 * Makes sure that a user was referred from another admin page.
1030 *
1031 * To avoid security exploits.
1032 *
1033 * @since 1.2.0
1034 *
1035 * @param int|string $action    Action nonce.
1036 * @param string     $query_arg Optional. Key to check for nonce in `$_REQUEST` (since 2.5).
1037 *                              Default '_wpnonce'.
1038 * @return false|int False if the nonce is invalid, 1 if the nonce is valid and generated between
1039 *                   0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
1040 */
1041function check_admin_referer( $action = -1, $query_arg = '_wpnonce' ) {
1042	if ( -1 == $action )
1043		_doing_it_wrong( __FUNCTION__, __( 'You should specify a nonce action to be verified by using the first parameter.' ), '3.2.0' );
1044
1045	$adminurl = strtolower(admin_url());
1046	$referer = strtolower(wp_get_referer());
1047	$result = isset($_REQUEST[$query_arg]) ? wp_verify_nonce($_REQUEST[$query_arg], $action) : false;
1048
1049	/**
1050	 * Fires once the admin request has been validated or not.
1051	 *
1052	 * @since 1.5.1
1053	 *
1054	 * @param string    $action The nonce action.
1055	 * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between
1056	 *                          0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
1057	 */
1058	do_action( 'check_admin_referer', $action, $result );
1059
1060	if ( ! $result && ! ( -1 == $action && strpos( $referer, $adminurl ) === 0 ) ) {
1061		wp_nonce_ays( $action );
1062		die();
1063	}
1064
1065	return $result;
1066}
1067endif;
1068
1069if ( !function_exists('check_ajax_referer') ) :
1070/**
1071 * Verifies the Ajax request to prevent processing requests external of the blog.
1072 *
1073 * @since 2.0.3
1074 *
1075 * @param int|string   $action    Action nonce.
1076 * @param false|string $query_arg Optional. Key to check for the nonce in `$_REQUEST` (since 2.5). If false,
1077 *                                `$_REQUEST` values will be evaluated for '_ajax_nonce', and '_wpnonce'
1078 *                                (in that order). Default false.
1079 * @param bool         $die       Optional. Whether to die early when the nonce cannot be verified.
1080 *                                Default true.
1081 * @return false|int False if the nonce is invalid, 1 if the nonce is valid and generated between
1082 *                   0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
1083 */
1084function check_ajax_referer( $action = -1, $query_arg = false, $die = true ) {
1085	if ( -1 == $action ) {
1086		_doing_it_wrong( __FUNCTION__, __( 'You should specify a nonce action to be verified by using the first parameter.' ), '4.7' );
1087	}
1088
1089	$nonce = '';
1090
1091	if ( $query_arg && isset( $_REQUEST[ $query_arg ] ) )
1092		$nonce = $_REQUEST[ $query_arg ];
1093	elseif ( isset( $_REQUEST['_ajax_nonce'] ) )
1094		$nonce = $_REQUEST['_ajax_nonce'];
1095	elseif ( isset( $_REQUEST['_wpnonce'] ) )
1096		$nonce = $_REQUEST['_wpnonce'];
1097
1098	$result = wp_verify_nonce( $nonce, $action );
1099
1100	/**
1101	 * Fires once the Ajax request has been validated or not.
1102	 *
1103	 * @since 2.1.0
1104	 *
1105	 * @param string    $action The Ajax nonce action.
1106	 * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between
1107	 *                          0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
1108	 */
1109	do_action( 'check_ajax_referer', $action, $result );
1110
1111	if ( $die && false === $result ) {
1112		if ( wp_doing_ajax() ) {
1113			wp_die( -1, 403 );
1114		} else {
1115			die( '-1' );
1116		}
1117	}
1118
1119	return $result;
1120}
1121endif;
1122
1123if ( !function_exists('wp_redirect') ) :
1124/**
1125 * Redirects to another page.
1126 *
1127 * Note: wp_redirect() does not exit automatically, and should almost always be
1128 * followed by a call to `exit;`:
1129 *
1130 *     wp_redirect( $url );
1131 *     exit;
1132 *
1133 * Exiting can also be selectively manipulated by using wp_redirect() as a conditional
1134 * in conjunction with the {@see 'wp_redirect'} and {@see 'wp_redirect_location'} hooks:
1135 *
1136 *     if ( wp_redirect( $url ) ) {
1137 *         exit;
1138 *     }
1139 *
1140 * @since 1.5.1
1141 *
1142 * @global bool $is_IIS
1143 *
1144 * @param string $location The path to redirect to.
1145 * @param int    $status   Status code to use.
1146 * @return bool False if $location is not provided, true otherwise.
1147 */
1148function wp_redirect($location, $status = 302) {
1149	global $is_IIS;
1150
1151	/**
1152	 * Filters the redirect location.
1153	 *
1154	 * @since 2.1.0
1155	 *
1156	 * @param string $location The path to redirect to.
1157	 * @param int    $status   Status code to use.
1158	 */
1159	$location = apply_filters( 'wp_redirect', $location, $status );
1160
1161	/**
1162	 * Filters the redirect status code.
1163	 *
1164	 * @since 2.3.0
1165	 *
1166	 * @param int    $status   Status code to use.
1167	 * @param string $location The path to redirect to.
1168	 */
1169	$status = apply_filters( 'wp_redirect_status', $status, $location );
1170
1171	if ( ! $location )
1172		return false;
1173
1174	$location = wp_sanitize_redirect($location);
1175
1176	if ( !$is_IIS && PHP_SAPI != 'cgi-fcgi' )
1177		status_header($status); // This causes problems on IIS and some FastCGI setups
1178
1179	header("Location: $location", true, $status);
1180
1181	return true;
1182}
1183endif;
1184
1185if ( !function_exists('wp_sanitize_redirect') ) :
1186/**
1187 * Sanitizes a URL for use in a redirect.
1188 *
1189 * @since 2.3.0
1190 *
1191 * @param string $location The path to redirect to.
1192 * @return string Redirect-sanitized URL.
1193 **/
1194function wp_sanitize_redirect($location) {
1195	$regex = '/
1196		(
1197			(?: [\xC2-\xDF][\x80-\xBF]        # double-byte sequences   110xxxxx 10xxxxxx
1198			|   \xE0[\xA0-\xBF][\x80-\xBF]    # triple-byte sequences   1110xxxx 10xxxxxx * 2
1199			|   [\xE1-\xEC][\x80-\xBF]{2}
1200			|   \xED[\x80-\x9F][\x80-\xBF]
1201			|   [\xEE-\xEF][\x80-\xBF]{2}
1202			|   \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences   11110xxx 10xxxxxx * 3
1203			|   [\xF1-\xF3][\x80-\xBF]{3}
1204			|   \xF4[\x80-\x8F][\x80-\xBF]{2}
1205		){1,40}                              # ...one or more times
1206		)/x';
1207	$location = preg_replace_callback( $regex, '_wp_sanitize_utf8_in_redirect', $location );
1208	$location = preg_replace('|[^a-z0-9-~+_.?#=&;,/:%!*\[\]()@]|i', '', $location);
1209	$location = wp_kses_no_null($location);
1210
1211	// remove %0d and %0a from location
1212	$strip = array('%0d', '%0a', '%0D', '%0A');
1213	return _deep_replace( $strip, $location );
1214}
1215
1216/**
1217 * URL encode UTF-8 characters in a URL.
1218 *
1219 * @ignore
1220 * @since 4.2.0
1221 * @access private
1222 *
1223 * @see wp_sanitize_redirect()
1224 *
1225 * @param array $matches RegEx matches against the redirect location.
1226 * @return string URL-encoded version of the first RegEx match.
1227 */
1228function _wp_sanitize_utf8_in_redirect( $matches ) {
1229	return urlencode( $matches[0] );
1230}
1231endif;
1232
1233if ( !function_exists('wp_safe_redirect') ) :
1234/**
1235 * Performs a safe (local) redirect, using wp_redirect().
1236 *
1237 * Checks whether the $location is using an allowed host, if it has an absolute
1238 * path. A plugin can therefore set or remove allowed host(s) to or from the
1239 * list.
1240 *
1241 * If the host is not allowed, then the redirect defaults to wp-admin on the siteurl
1242 * instead. This prevents malicious redirects which redirect to another host,
1243 * but only used in a few places.
1244 *
1245 * @since 2.3.0
1246 *
1247 * @param string $location The path to redirect to.
1248 * @param int    $status   Status code to use.
1249 */
1250function wp_safe_redirect($location, $status = 302) {
1251
1252	// Need to look at the URL the way it will end up in wp_redirect()
1253	$location = wp_sanitize_redirect($location);
1254
1255	/**
1256	 * Filters the redirect fallback URL for when the provided redirect is not safe (local).
1257	 *
1258	 * @since 4.3.0
1259	 *
1260	 * @param string $fallback_url The fallback URL to use by default.
1261	 * @param int    $status       The redirect status.
1262	 */
1263	$location = wp_validate_redirect( $location, apply_filters( 'wp_safe_redirect_fallback', admin_url(), $status ) );
1264
1265	wp_redirect($location, $status);
1266}
1267endif;
1268
1269if ( !function_exists('wp_validate_redirect') ) :
1270/**
1271 * Validates a URL for use in a redirect.
1272 *
1273 * Checks whether the $location is using an allowed host, if it has an absolute
1274 * path. A plugin can therefore set or remove allowed host(s) to or from the
1275 * list.
1276 *
1277 * If the host is not allowed, then the redirect is to $default supplied
1278 *
1279 * @since 2.8.1
1280 *
1281 * @param string $location The redirect to validate
1282 * @param string $default  The value to return if $location is not allowed
1283 * @return string redirect-sanitized URL
1284 **/
1285function wp_validate_redirect($location, $default = '') {
1286	$location = trim( $location, " \t\n\r\0\x08\x0B" );
1287	// browsers will assume 'http' is your protocol, and will obey a redirect to a URL starting with '//'
1288	if ( substr($location, 0, 2) == '//' )
1289		$location = 'http:' . $location;
1290
1291	// In php 5 parse_url may fail if the URL query part contains http://, bug #38143
1292	$test = ( $cut = strpos($location, '?') ) ? substr( $location, 0, $cut ) : $location;
1293
1294	// @-operator is used to prevent possible warnings in PHP < 5.3.3.
1295	$lp = @parse_url($test);
1296
1297	// Give up if malformed URL
1298	if ( false === $lp )
1299		return $default;
1300
1301	// Allow only http and https schemes. No data:, etc.
1302	if ( isset($lp['scheme']) && !('http' == $lp['scheme'] || 'https' == $lp['scheme']) )
1303		return $default;
1304
1305	// Reject if certain components are set but host is not. This catches urls like https:host.com for which parse_url does not set the host field.
1306	if ( ! isset( $lp['host'] ) && ( isset( $lp['scheme'] ) || isset( $lp['user'] ) || isset( $lp['pass'] ) || isset( $lp['port'] ) ) ) {
1307		return $default;
1308	}
1309
1310	// Reject malformed components parse_url() can return on odd inputs.
1311	foreach ( array( 'user', 'pass', 'host' ) as $component ) {
1312		if ( isset( $lp[ $component ] ) && strpbrk( $lp[ $component ], ':/?#@' ) ) {
1313			return $default;
1314		}
1315	}
1316
1317	$wpp = parse_url(home_url());
1318
1319	/**
1320	 * Filters the whitelist of hosts to redirect to.
1321	 *
1322	 * @since 2.3.0
1323	 *
1324	 * @param array       $hosts An array of allowed hosts.
1325	 * @param bool|string $host  The parsed host; empty if not isset.
1326	 */
1327	$allowed_hosts = (array) apply_filters( 'allowed_redirect_hosts', array($wpp['host']), isset($lp['host']) ? $lp['host'] : '' );
1328
1329	if ( isset($lp['host']) && ( !in_array($lp['host'], $allowed_hosts) && $lp['host'] != strtolower($wpp['host'])) )
1330		$location = $default;
1331
1332	return $location;
1333}
1334endif;
1335
1336if ( ! function_exists('wp_notify_postauthor') ) :
1337/**
1338 * Notify an author (and/or others) of a comment/trackback/pingback on a post.
1339 *
1340 * @since 1.0.0
1341 *
1342 * @param int|WP_Comment  $comment_id Comment ID or WP_Comment object.
1343 * @param string          $deprecated Not used
1344 * @return bool True on completion. False if no email addresses were specified.
1345 */
1346function wp_notify_postauthor( $comment_id, $deprecated = null ) {
1347	if ( null !== $deprecated ) {
1348		_deprecated_argument( __FUNCTION__, '3.8.0' );
1349	}
1350
1351	$comment = get_comment( $comment_id );
1352	if ( empty( $comment ) || empty( $comment->comment_post_ID ) )
1353		return false;
1354
1355	$post    = get_post( $comment->comment_post_ID );
1356	$author  = get_userdata( $post->post_author );
1357
1358	// Who to notify? By default, just the post author, but others can be added.
1359	$emails = array();
1360	if ( $author ) {
1361		$emails[] = $author->user_email;
1362	}
1363
1364	/**
1365	 * Filters the list of email addresses to receive a comment notification.
1366	 *
1367	 * By default, only post authors are notified of comments. This filter allows
1368	 * others to be added.
1369	 *
1370	 * @since 3.7.0
1371	 *
1372	 * @param array $emails     An array of email addresses to receive a comment notification.
1373	 * @param int   $comment_id The comment ID.
1374	 */
1375	$emails = apply_filters( 'comment_notification_recipients', $emails, $comment->comment_ID );
1376	$emails = array_filter( $emails );
1377
1378	// If there are no addresses to send the comment to, bail.
1379	if ( ! count( $emails ) ) {
1380		return false;
1381	}
1382
1383	// Facilitate unsetting below without knowing the keys.
1384	$emails = array_flip( $emails );
1385
1386	/**
1387	 * Filters whether to notify comment authors of their comments on their own posts.
1388	 *
1389	 * By default, comment authors aren't notified of their comments on their own
1390	 * posts. This filter allows you to override that.
1391	 *
1392	 * @since 3.8.0
1393	 *
1394	 * @param bool $notify     Whether to notify the post author of their own comment.
1395	 *                         Default false.
1396	 * @param int  $comment_id The comment ID.
1397	 */
1398	$notify_author = apply_filters( 'comment_notification_notify_author', false, $comment->comment_ID );
1399
1400	// The comment was left by the author
1401	if ( $author && ! $notify_author && $comment->user_id == $post->post_author ) {
1402		unset( $emails[ $author->user_email ] );
1403	}
1404
1405	// The author moderated a comment on their own post
1406	if ( $author && ! $notify_author && $post->post_author == get_current_user_id() ) {
1407		unset( $emails[ $author->user_email ] );
1408	}
1409
1410	// The post author is no longer a member of the blog
1411	if ( $author && ! $notify_author && ! user_can( $post->post_author, 'read_post', $post->ID ) ) {
1412		unset( $emails[ $author->user_email ] );
1413	}
1414
1415	// If there's no email to send the comment to, bail, otherwise flip array back around for use below
1416	if ( ! count( $emails ) ) {
1417		return false;
1418	} else {
1419		$emails = array_flip( $emails );
1420	}
1421
1422	$switched_locale = switch_to_locale( get_locale() );
1423
1424	$comment_author_domain = @gethostbyaddr($comment->comment_author_IP);
1425
1426	// The blogname option is escaped with esc_html on the way into the database in sanitize_option
1427	// we want to reverse this for the plain text arena of emails.
1428	$blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
1429	$comment_content = wp_specialchars_decode( $comment->comment_content );
1430
1431	switch ( $comment->comment_type ) {
1432		case 'trackback':
1433			/* translators: 1: Post title */
1434			$notify_message  = sprintf( __( 'New trackback on your post "%s"' ), $post->post_title ) . "\r\n";
1435			/* translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */
1436			$notify_message .= sprintf( __('Website: %1$s (IP: %2$s, %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
1437			$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
1438			$notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
1439			$notify_message .= __( 'You can see all trackbacks on this post here:' ) . "\r\n";
1440			/* translators: 1: blog name, 2: post title */
1441			$subject = sprintf( __('[%1$s] Trackback: "%2$s"'), $blogname, $post->post_title );
1442			break;
1443		case 'pingback':
1444			/* translators: 1: Post title */
1445			$notify_message  = sprintf( __( 'New pingback on your post "%s"' ), $post->post_title ) . "\r\n";
1446			/* translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */
1447			$notify_message .= sprintf( __('Website: %1$s (IP: %2$s, %3$s)'), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
1448			$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
1449			$notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
1450			$notify_message .= __( 'You can see all pingbacks on this post here:' ) . "\r\n";
1451			/* translators: 1: blog name, 2: post title */
1452			$subject = sprintf( __('[%1$s] Pingback: "%2$s"'), $blogname, $post->post_title );
1453			break;
1454		default: // Comments
1455			$notify_message  = sprintf( __( 'New comment on your post "%s"' ), $post->post_title ) . "\r\n";
1456			/* translators: 1: comment author, 2: author IP, 3: author domain */
1457			$notify_message .= sprintf( __( 'Author: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
1458			$notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n";
1459			$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
1460			$notify_message .= sprintf( __('Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
1461			$notify_message .= __( 'You can see all comments on this post here:' ) . "\r\n";
1462			/* translators: 1: blog name, 2: post title */
1463			$subject = sprintf( __('[%1$s] Comment: "%2$s"'), $blogname, $post->post_title );
1464			break;
1465	}
1466	$notify_message .= get_permalink($comment->comment_post_ID) . "#comments\r\n\r\n";
1467	$notify_message .= sprintf( __('Permalink: %s'), get_comment_link( $comment ) ) . "\r\n";
1468
1469	if ( user_can( $post->post_author, 'edit_comment', $comment->comment_ID ) ) {
1470		if ( EMPTY_TRASH_DAYS ) {
1471			$notify_message .= sprintf( __( 'Trash it: %s' ), admin_url( "comment.php?action=trash&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n";
1472		} else {
1473			$notify_message .= sprintf( __( 'Delete it: %s' ), admin_url( "comment.php?action=delete&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n";
1474		}
1475		$notify_message .= sprintf( __( 'Spam it: %s' ), admin_url( "comment.php?action=spam&c={$comment->comment_ID}#wpbody-content" ) ) . "\r\n";
1476	}
1477
1478	$wp_email = 'wordpress@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME']));
1479
1480	if ( '' == $comment->comment_author ) {
1481		$from = "From: \"$blogname\" <$wp_email>";
1482		if ( '' != $comment->comment_author_email )
1483			$reply_to = "Reply-To: $comment->comment_author_email";
1484	} else {
1485		$from = "From: \"$comment->comment_author\" <$wp_email>";
1486		if ( '' != $comment->comment_author_email )
1487			$reply_to = "Reply-To: \"$comment->comment_author_email\" <$comment->comment_author_email>";
1488	}
1489
1490	$message_headers = "$from\n"
1491		. "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";
1492
1493	if ( isset($reply_to) )
1494		$message_headers .= $reply_to . "\n";
1495
1496	/**
1497	 * Filters the comment notification email text.
1498	 *
1499	 * @since 1.5.2
1500	 *
1501	 * @param string $notify_message The comment notification email text.
1502	 * @param int    $comment_id     Comment ID.
1503	 */
1504	$notify_message = apply_filters( 'comment_notification_text', $notify_message, $comment->comment_ID );
1505
1506	/**
1507	 * Filters the comment notification email subject.
1508	 *
1509	 * @since 1.5.2
1510	 *
1511	 * @param string $subject    The comment notification email subject.
1512	 * @param int    $comment_id Comment ID.
1513	 */
1514	$subject = apply_filters( 'comment_notification_subject', $subject, $comment->comment_ID );
1515
1516	/**
1517	 * Filters the comment notification email headers.
1518	 *
1519	 * @since 1.5.2
1520	 *
1521	 * @param string $message_headers Headers for the comment notification email.
1522	 * @param int    $comment_id      Comment ID.
1523	 */
1524	$message_headers = apply_filters( 'comment_notification_headers', $message_headers, $comment->comment_ID );
1525
1526	foreach ( $emails as $email ) {
1527		@wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers );
1528	}
1529
1530	if ( $switched_locale ) {
1531		restore_previous_locale();
1532	}
1533
1534	return true;
1535}
1536endif;
1537
1538if ( !function_exists('wp_notify_moderator') ) :
1539/**
1540 * Notifies the moderator of the site about a new comment that is awaiting approval.
1541 *
1542 * @since 1.0.0
1543 *
1544 * @global wpdb $wpdb WordPress database abstraction object.
1545 *
1546 * Uses the {@see 'notify_moderator'} filter to determine whether the site moderator
1547 * should be notified, overriding the site setting.
1548 *
1549 * @param int $comment_id Comment ID.
1550 * @return true Always returns true.
1551 */
1552function wp_notify_moderator($comment_id) {
1553	global $wpdb;
1554
1555	$maybe_notify = get_option( 'moderation_notify' );
1556
1557	/**
1558	 * Filters whether to send the site moderator email notifications, overriding the site setting.
1559	 *
1560	 * @since 4.4.0
1561	 *
1562	 * @param bool $maybe_notify Whether to notify blog moderator.
1563	 * @param int  $comment_ID   The id of the comment for the notification.
1564	 */
1565	$maybe_notify = apply_filters( 'notify_moderator', $maybe_notify, $comment_id );
1566
1567	if ( ! $maybe_notify ) {
1568		return true;
1569	}
1570
1571	$comment = get_comment($comment_id);
1572	$post = get_post($comment->comment_post_ID);
1573	$user = get_userdata( $post->post_author );
1574	// Send to the administration and to the post author if the author can modify the comment.
1575	$emails = array( get_option( 'admin_email' ) );
1576	if ( $user && user_can( $user->ID, 'edit_comment', $comment_id ) && ! empty( $user->user_email ) ) {
1577		if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) )
1578			$emails[] = $user->user_email;
1579	}
1580
1581	$switched_locale = switch_to_locale( get_locale() );
1582
1583	$comment_author_domain = @gethostbyaddr($comment->comment_author_IP);
1584	$comments_waiting = $wpdb->get_var("SELECT count(comment_ID) FROM $wpdb->comments WHERE comment_approved = '0'");
1585
1586	// The blogname option is escaped with esc_html on the way into the database in sanitize_option
1587	// we want to reverse this for the plain text arena of emails.
1588	$blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
1589	$comment_content = wp_specialchars_decode( $comment->comment_content );
1590
1591	switch ( $comment->comment_type ) {
1592		case 'trackback':
1593			/* translators: 1: Post title */
1594			$notify_message  = sprintf( __('A new trackback on the post "%s" is waiting for your approval'), $post->post_title ) . "\r\n";
1595			$notify_message .= get_permalink($comment->comment_post_ID) . "\r\n\r\n";
1596			/* translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */
1597			$notify_message .= sprintf( __( 'Website: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
1598			/* translators: 1: Trackback/pingback/comment author URL */
1599			$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
1600			$notify_message .= __('Trackback excerpt: ') . "\r\n" . $comment_content . "\r\n\r\n";
1601			break;
1602		case 'pingback':
1603			/* translators: 1: Post title */
1604			$notify_message  = sprintf( __('A new pingback on the post "%s" is waiting for your approval'), $post->post_title ) . "\r\n";
1605			$notify_message .= get_permalink($comment->comment_post_ID) . "\r\n\r\n";
1606			/* translators: 1: Trackback/pingback website name, 2: website IP, 3: website hostname */
1607			$notify_message .= sprintf( __( 'Website: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
1608			/* translators: 1: Trackback/pingback/comment author URL */
1609			$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
1610			$notify_message .= __('Pingback excerpt: ') . "\r\n" . $comment_content . "\r\n\r\n";
1611			break;
1612		default: // Comments
1613			/* translators: 1: Post title */
1614			$notify_message  = sprintf( __('A new comment on the post "%s" is waiting for your approval'), $post->post_title ) . "\r\n";
1615			$notify_message .= get_permalink($comment->comment_post_ID) . "\r\n\r\n";
1616			/* translators: 1: Comment author name, 2: comment author's IP, 3: comment author IP's hostname */
1617			$notify_message .= sprintf( __( 'Author: %1$s (IP: %2$s, %3$s)' ), $comment->comment_author, $comment->comment_author_IP, $comment_author_domain ) . "\r\n";
1618			/* translators: 1: Comment author URL */
1619			$notify_message .= sprintf( __( 'Email: %s' ), $comment->comment_author_email ) . "\r\n";
1620			/* translators: 1: Trackback/pingback/comment author URL */
1621			$notify_message .= sprintf( __( 'URL: %s' ), $comment->comment_author_url ) . "\r\n";
1622			/* translators: 1: Comment text */
1623			$notify_message .= sprintf( __( 'Comment: %s' ), "\r\n" . $comment_content ) . "\r\n\r\n";
1624			break;
1625	}
1626
1627	/* translators: Comment moderation. 1: Comment action URL */
1628	$notify_message .= sprintf( __( 'Approve it: %s' ), admin_url( "comment.php?action=approve&c={$comment_id}#wpbody-content" ) ) . "\r\n";
1629
1630	if ( EMPTY_TRASH_DAYS ) {
1631		/* translators: Comment moderation. 1: Comment action URL */
1632		$notify_message .= sprintf( __( 'Trash it: %s' ), admin_url( "comment.php?action=trash&c={$comment_id}#wpbody-content" ) ) . "\r\n";
1633	} else {
1634		/* translators: Comment moderation. 1: Comment action URL */
1635		$notify_message .= sprintf( __( 'Delete it: %s' ), admin_url( "comment.php?action=delete&c={$comment_id}#wpbody-content" ) ) . "\r\n";
1636	}
1637
1638	/* translators: Comment moderation. 1: Comment action URL */
1639	$notify_message .= sprintf( __( 'Spam it: %s' ), admin_url( "comment.php?action=spam&c={$comment_id}#wpbody-content" ) ) . "\r\n";
1640
1641	/* translators: Comment moderation. 1: Number of comments awaiting approval */
1642	$notify_message .= sprintf( _n('Currently %s comment is waiting for approval. Please visit the moderation panel:',
1643 		'Currently %s comments are waiting for approval. Please visit the moderation panel:', $comments_waiting), number_format_i18n($comments_waiting) ) . "\r\n";
1644	$notify_message .= admin_url( "edit-comments.php?comment_status=moderated#wpbody-content" ) . "\r\n";
1645
1646	/* translators: Comment moderation notification email subject. 1: Site name, 2: Post title */
1647	$subject = sprintf( __('[%1$s] Please moderate: "%2$s"'), $blogname, $post->post_title );
1648	$message_headers = '';
1649
1650	/**
1651	 * Filters the list of recipients for comment moderation emails.
1652	 *
1653	 * @since 3.7.0
1654	 *
1655	 * @param array $emails     List of email addresses to notify for comment moderation.
1656	 * @param int   $comment_id Comment ID.
1657	 */
1658	$emails = apply_filters( 'comment_moderation_recipients', $emails, $comment_id );
1659
1660	/**
1661	 * Filters the comment moderation email text.
1662	 *
1663	 * @since 1.5.2
1664	 *
1665	 * @param string $notify_message Text of the comment moderation email.
1666	 * @param int    $comment_id     Comment ID.
1667	 */
1668	$notify_message = apply_filters( 'comment_moderation_text', $notify_message, $comment_id );
1669
1670	/**
1671	 * Filters the comment moderation email subject.
1672	 *
1673	 * @since 1.5.2
1674	 *
1675	 * @param string $subject    Subject of the comment moderation email.
1676	 * @param int    $comment_id Comment ID.
1677	 */
1678	$subject = apply_filters( 'comment_moderation_subject', $subject, $comment_id );
1679
1680	/**
1681	 * Filters the comment moderation email headers.
1682	 *
1683	 * @since 2.8.0
1684	 *
1685	 * @param string $message_headers Headers for the comment moderation email.
1686	 * @param int    $comment_id      Comment ID.
1687	 */
1688	$message_headers = apply_filters( 'comment_moderation_headers', $message_headers, $comment_id );
1689
1690	foreach ( $emails as $email ) {
1691		@wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers );
1692	}
1693
1694	if ( $switched_locale ) {
1695		restore_previous_locale();
1696	}
1697
1698	return true;
1699}
1700endif;
1701
1702if ( !function_exists('wp_password_change_notification') ) :
1703/**
1704 * Notify the blog admin of a user changing password, normally via email.
1705 *
1706 * @since 2.7.0
1707 *
1708 * @param WP_User $user User object.
1709 */
1710function wp_password_change_notification( $user ) {
1711	// send a copy of password change notification to the admin
1712	// but check to see if it's the admin whose password we're changing, and skip this
1713	if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) ) {
1714		/* translators: %s: user name */
1715		$message = sprintf( __( 'Password changed for user: %s' ), $user->user_login ) . "\r\n";
1716		// The blogname option is escaped with esc_html on the way into the database in sanitize_option
1717		// we want to reverse this for the plain text arena of emails.
1718		$blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
1719		/* translators: %s: site title */
1720		wp_mail( get_option( 'admin_email' ), sprintf( __( '[%s] Password Changed' ), $blogname ), $message );
1721	}
1722}
1723endif;
1724
1725if ( !function_exists('wp_new_user_notification') ) :
1726/**
1727 * Email login credentials to a newly-registered user.
1728 *
1729 * A new user registration notification is also sent to admin email.
1730 *
1731 * @since 2.0.0
1732 * @since 4.3.0 The `$plaintext_pass` parameter was changed to `$notify`.
1733 * @since 4.3.1 The `$plaintext_pass` parameter was deprecated. `$notify` added as a third parameter.
1734 * @since 4.6.0 The `$notify` parameter accepts 'user' for sending notification only to the user created.
1735 *
1736 * @global wpdb         $wpdb      WordPress database object for queries.
1737 * @global PasswordHash $wp_hasher Portable PHP password hashing framework instance.
1738 *
1739 * @param int    $user_id    User ID.
1740 * @param null   $deprecated Not used (argument deprecated).
1741 * @param string $notify     Optional. Type of notification that should happen. Accepts 'admin' or an empty
1742 *                           string (admin only), 'user', or 'both' (admin and user). Default empty.
1743 */
1744function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' ) {
1745	if ( $deprecated !== null ) {
1746		_deprecated_argument( __FUNCTION__, '4.3.1' );
1747	}
1748
1749	global $wpdb, $wp_hasher;
1750	$user = get_userdata( $user_id );
1751
1752	// The blogname option is escaped with esc_html on the way into the database in sanitize_option
1753	// we want to reverse this for the plain text arena of emails.
1754	$blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);
1755
1756	if ( 'user' !== $notify ) {
1757		$switched_locale = switch_to_locale( get_locale() );
1758		$message  = sprintf( __( 'New user registration on your site %s:' ), $blogname ) . "\r\n\r\n";
1759		$message .= sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
1760		$message .= sprintf( __( 'Email: %s' ), $user->user_email ) . "\r\n";
1761
1762		@wp_mail( get_option( 'admin_email' ), sprintf( __( '[%s] New User Registration' ), $blogname ), $message );
1763
1764		if ( $switched_locale ) {
1765			restore_previous_locale();
1766		}
1767	}
1768
1769	// `$deprecated was pre-4.3 `$plaintext_pass`. An empty `$plaintext_pass` didn't sent a user notification.
1770	if ( 'admin' === $notify || ( empty( $deprecated ) && empty( $notify ) ) ) {
1771		return;
1772	}
1773
1774	// Generate something random for a password reset key.
1775	$key = wp_generate_password( 20, false );
1776
1777	/** This action is documented in wp-login.php */
1778	do_action( 'retrieve_password_key', $user->user_login, $key );
1779
1780	// Now insert the key, hashed, into the DB.
1781	if ( empty( $wp_hasher ) ) {
1782		$wp_hasher = new PasswordHash( 8, true );
1783	}
1784	$hashed = time() . ':' . $wp_hasher->HashPassword( $key );
1785	$wpdb->update( $wpdb->users, array( 'user_activation_key' => $hashed ), array( 'user_login' => $user->user_login ) );
1786
1787	$switched_locale = switch_to_locale( get_user_locale( $user ) );
1788
1789	$message = sprintf(__('Username: %s'), $user->user_login) . "\r\n\r\n";
1790	$message .= __('To set your password, visit the following address:') . "\r\n\r\n";
1791	$message .= '<' . network_site_url("wp-login.php?action=rp&key=$key&login=" . rawurlencode($user->user_login), 'login') . ">\r\n\r\n";
1792
1793	$message .= wp_login_url() . "\r\n";
1794
1795	wp_mail($user->user_email, sprintf(__('[%s] Your username and password info'), $blogname), $message);
1796
1797	if ( $switched_locale ) {
1798		restore_previous_locale();
1799	}
1800}
1801endif;
1802
1803if ( !function_exists('wp_nonce_tick') ) :
1804/**
1805 * Get the time-dependent variable for nonce creation.
1806 *
1807 * A nonce has a lifespan of two ticks. Nonces in their second tick may be
1808 * updated, e.g. by autosave.
1809 *
1810 * @since 2.5.0
1811 *
1812 * @return float Float value rounded up to the next highest integer.
1813 */
1814function wp_nonce_tick() {
1815	/**
1816	 * Filters the lifespan of nonces in seconds.
1817	 *
1818	 * @since 2.5.0
1819	 *
1820	 * @param int $lifespan Lifespan of nonces in seconds. Default 86,400 seconds, or one day.
1821	 */
1822	$nonce_life = apply_filters( 'nonce_life', DAY_IN_SECONDS );
1823
1824	return ceil(time() / ( $nonce_life / 2 ));
1825}
1826endif;
1827
1828if ( !function_exists('wp_verify_nonce') ) :
1829/**
1830 * Verify that correct nonce was used with time limit.
1831 *
1832 * The user is given an amount of time to use the token, so therefore, since the
1833 * UID and $action remain the same, the independent variable is the time.
1834 *
1835 * @since 2.0.3
1836 *
1837 * @param string     $nonce  Nonce that was used in the form to verify
1838 * @param string|int $action Should give context to what is taking place and be the same when nonce was created.
1839 * @return false|int False if the nonce is invalid, 1 if the nonce is valid and generated between
1840 *                   0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
1841 */
1842function wp_verify_nonce( $nonce, $action = -1 ) {
1843	$nonce = (string) $nonce;
1844	$user = wp_get_current_user();
1845	$uid = (int) $user->ID;
1846	if ( ! $uid ) {
1847		/**
1848		 * Filters whether the user who generated the nonce is logged out.
1849		 *
1850		 * @since 3.5.0
1851		 *
1852		 * @param int    $uid    ID of the nonce-owning user.
1853		 * @param string $action The nonce action.
1854		 */
1855		$uid = apply_filters( 'nonce_user_logged_out', $uid, $action );
1856	}
1857
1858	if ( empty( $nonce ) ) {
1859		return false;
1860	}
1861
1862	$token = wp_get_session_token();
1863	$i = wp_nonce_tick();
1864
1865	// Nonce generated 0-12 hours ago
1866	$expected = substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce'), -12, 10 );
1867	if ( hash_equals( $expected, $nonce ) ) {
1868		return 1;
1869	}
1870
1871	// Nonce generated 12-24 hours ago
1872	$expected = substr( wp_hash( ( $i - 1 ) . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
1873	if ( hash_equals( $expected, $nonce ) ) {
1874		return 2;
1875	}
1876
1877	/**
1878	 * Fires when nonce verification fails.
1879	 *
1880	 * @since 4.4.0
1881	 *
1882	 * @param string     $nonce  The invalid nonce.
1883	 * @param string|int $action The nonce action.
1884	 * @param WP_User    $user   The current user object.
1885	 * @param string     $token  The user's session token.
1886	 */
1887	do_action( 'wp_verify_nonce_failed', $nonce, $action, $user, $token );
1888
1889	// Invalid nonce
1890	return false;
1891}
1892endif;
1893
1894if ( !function_exists('wp_create_nonce') ) :
1895/**
1896 * Creates a cryptographic token tied to a specific action, user, user session,
1897 * and window of time.
1898 *
1899 * @since 2.0.3
1900 * @since 4.0.0 Session tokens were integrated with nonce creation
1901 *
1902 * @param string|int $action Scalar value to add context to the nonce.
1903 * @return string The token.
1904 */
1905function wp_create_nonce($action = -1) {
1906	$user = wp_get_current_user();
1907	$uid = (int) $user->ID;
1908	if ( ! $uid ) {
1909		/** This filter is documented in wp-includes/pluggable.php */
1910		$uid = apply_filters( 'nonce_user_logged_out', $uid, $action );
1911	}
1912
1913	$token = wp_get_session_token();
1914	$i = wp_nonce_tick();
1915
1916	return substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
1917}
1918endif;
1919
1920if ( !function_exists('wp_salt') ) :
1921/**
1922 * Get salt to add to hashes.
1923 *
1924 * Salts are created using secret keys. Secret keys are located in two places:
1925 * in the database and in the wp-config.php file. The secret key in the database
1926 * is randomly generated and will be appended to the secret keys in wp-config.php.
1927 *
1928 * The secret keys in wp-config.php should be updated to strong, random keys to maximize
1929 * security. Below is an example of how the secret key constants are defined.
1930 * Do not paste this example directly into wp-config.php. Instead, have a
1931 * {@link https://api.wordpress.org/secret-key/1.1/salt/ secret key created} just
1932 * for you.
1933 *
1934 *     define('AUTH_KEY',         ' Xakm<o xQy rw4EMsLKM-?!T+,PFF})H4lzcW57AF0U@N@< >M%G4Yt>f`z]MON');
1935 *     define('SECURE_AUTH_KEY',  'LzJ}op]mr|6+![P}Ak:uNdJCJZd>(Hx.-Mh#Tz)pCIU#uGEnfFz|f ;;eU%/U^O~');
1936 *     define('LOGGED_IN_KEY',    '|i|Ux`9<p-h$aFf(qnT:sDO:D1P^wZ$$/Ra@miTJi9G;ddp_<q}6H1)o|a +&JCM');
1937 *     define('NONCE_KEY',        '%:R{[P|,s.KuMltH5}cI;/k<Gx~j!f0I)m_sIyu+&NJZ)-iO>z7X>QYR0Z_XnZ@|');
1938 *     define('AUTH_SALT',        'eZyT)-Naw]F8CwA*VaW#q*|.)g@o}||wf~@C-YSt}(dh_r6EbI#A,y|nU2{B#JBW');
1939 *     define('SECURE_AUTH_SALT', '!=oLUTXh,QW=H `}`L|9/^4-3 STz},T(w}W<I`.JjPi)<Bmf1v,HpGe}T1:Xt7n');
1940 *     define('LOGGED_IN_SALT',   '+XSqHc;@Q*K_b|Z?NC[3H!!EONbh.n<+=uKR:>*c(u`g~EJBf#8u#R{mUEZrozmm');
1941 *     define('NONCE_SALT',       'h`GXHhD>SLWVfg1(1(N{;.V!MoE(SfbA_ksP@&`+AycHcAV$+?@3q+rxV{%^VyKT');
1942 *
1943 * Salting passwords helps against tools which has stored hashed values of
1944 * common dictionary strings. The added values makes it harder to crack.
1945 *
1946 * @since 2.5.0
1947 *
1948 * @link https://api.wordpress.org/secret-key/1.1/salt/ Create secrets for wp-config.php
1949 *
1950 * @staticvar array $cached_salts
1951 * @staticvar array $duplicated_keys
1952 *
1953 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce)
1954 * @return string Salt value
1955 */
1956function wp_salt( $scheme = 'auth' ) {
1957	static $cached_salts = array();
1958	if ( isset( $cached_salts[ $scheme ] ) ) {
1959		/**
1960		 * Filters the WordPress salt.
1961		 *
1962		 * @since 2.5.0
1963		 *
1964		 * @param string $cached_salt Cached salt for the given scheme.
1965		 * @param string $scheme      Authentication scheme. Values include 'auth',
1966		 *                            'secure_auth', 'logged_in', and 'nonce'.
1967		 */
1968		return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme );
1969	}
1970
1971	static $duplicated_keys;
1972	if ( null === $duplicated_keys ) {
1973		$duplicated_keys = array( 'put your unique phrase here' => true );
1974		foreach ( array( 'AUTH', 'SECURE_AUTH', 'LOGGED_IN', 'NONCE', 'SECRET' ) as $first ) {
1975			foreach ( array( 'KEY', 'SALT' ) as $second ) {
1976				if ( ! defined( "{$first}_{$second}" ) ) {
1977					continue;
1978				}
1979				$value = constant( "{$first}_{$second}" );
1980				$duplicated_keys[ $value ] = isset( $duplicated_keys[ $value ] );
1981			}
1982		}
1983	}
1984
1985	$values = array(
1986		'key' => '',
1987		'salt' => ''
1988	);
1989	if ( defined( 'SECRET_KEY' ) && SECRET_KEY && empty( $duplicated_keys[ SECRET_KEY ] ) ) {
1990		$values['key'] = SECRET_KEY;
1991	}
1992	if ( 'auth' == $scheme && defined( 'SECRET_SALT' ) && SECRET_SALT && empty( $duplicated_keys[ SECRET_SALT ] ) ) {
1993		$values['salt'] = SECRET_SALT;
1994	}
1995
1996	if ( in_array( $scheme, array( 'auth', 'secure_auth', 'logged_in', 'nonce' ) ) ) {
1997		foreach ( array( 'key', 'salt' ) as $type ) {
1998			$const = strtoupper( "{$scheme}_{$type}" );
1999			if ( defined( $const ) && constant( $const ) && empty( $duplicated_keys[ constant( $const ) ] ) ) {
2000				$values[ $type ] = constant( $const );
2001			} elseif ( ! $values[ $type ] ) {
2002				$values[ $type ] = get_site_option( "{$scheme}_{$type}" );
2003				if ( ! $values[ $type ] ) {
2004					$values[ $type ] = wp_generate_password( 64, true, true );
2005					update_site_option( "{$scheme}_{$type}", $values[ $type ] );
2006				}
2007			}
2008		}
2009	} else {
2010		if ( ! $values['key'] ) {
2011			$values['key'] = get_site_option( 'secret_key' );
2012			if ( ! $values['key'] ) {
2013				$values['key'] = wp_generate_password( 64, true, true );
2014				update_site_option( 'secret_key', $values['key'] );
2015			}
2016		}
2017		$values['salt'] = hash_hmac( 'md5', $scheme, $values['key'] );
2018	}
2019
2020	$cached_salts[ $scheme ] = $values['key'] . $values['salt'];
2021
2022	/** This filter is documented in wp-includes/pluggable.php */
2023	return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme );
2024}
2025endif;
2026
2027if ( !function_exists('wp_hash') ) :
2028/**
2029 * Get hash of given string.
2030 *
2031 * @since 2.0.3
2032 *
2033 * @param string $data   Plain text to hash
2034 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce)
2035 * @return string Hash of $data
2036 */
2037function wp_hash($data, $scheme = 'auth') {
2038	$salt = wp_salt($scheme);
2039
2040	return hash_hmac('md5', $data, $salt);
2041}
2042endif;
2043
2044if ( !function_exists('wp_hash_password') ) :
2045/**
2046 * Create a hash (encrypt) of a plain text password.
2047 *
2048 * For integration with other applications, this function can be overwritten to
2049 * instead use the other package password checking algorithm.
2050 *
2051 * @since 2.5.0
2052 *
2053 * @global PasswordHash $wp_hasher PHPass object
2054 *
2055 * @param string $password Plain text user password to hash
2056 * @return string The hash string of the password
2057 */
2058function wp_hash_password($password) {
2059	global $wp_hasher;
2060
2061	if ( empty($wp_hasher) ) {
2062		// By default, use the portable hash from phpass
2063		$wp_hasher = new PasswordHash(8, true);
2064	}
2065
2066	return $wp_hasher->HashPassword( trim( $password ) );
2067}
2068endif;
2069
2070if ( !function_exists('wp_check_password') ) :
2071/**
2072 * Checks the plaintext password against the encrypted Password.
2073 *
2074 * Maintains compatibility between old version and the new cookie authentication
2075 * protocol using PHPass library. The $hash parameter is the encrypted password
2076 * and the function compares the plain text password when encrypted similarly
2077 * against the already encrypted password to see if they match.
2078 *
2079 * For integration with other applications, this function can be overwritten to
2080 * instead use the other package password checking algorithm.
2081 *
2082 * @since 2.5.0
2083 *
2084 * @global PasswordHash $wp_hasher PHPass object used for checking the password
2085 *	against the $hash + $password
2086 * @uses PasswordHash::CheckPassword
2087 *
2088 * @param string     $password Plaintext user's password
2089 * @param string     $hash     Hash of the user's password to check against.
2090 * @param string|int $user_id  Optional. User ID.
2091 * @return bool False, if the $password does not match the hashed password
2092 */
2093function wp_check_password($password, $hash, $user_id = '') {
2094	global $wp_hasher;
2095
2096	// If the hash is still md5...
2097	if ( strlen($hash) <= 32 ) {
2098		$check = hash_equals( $hash, md5( $password ) );
2099		if ( $check && $user_id ) {
2100			// Rehash using new hash.
2101			wp_set_password($password, $user_id);
2102			$hash = wp_hash_password($password);
2103		}
2104
2105		/**
2106		 * Filters whether the plaintext password matches the encrypted password.
2107		 *
2108		 * @since 2.5.0
2109		 *
2110		 * @param bool       $check    Whether the passwords match.
2111		 * @param string     $password The plaintext password.
2112		 * @param string     $hash     The hashed password.
2113		 * @param string|int $user_id  User ID. Can be empty.
2114		 */
2115		return apply_filters( 'check_password', $check, $password, $hash, $user_id );
2116	}
2117
2118	// If the stored hash is longer than an MD5, presume the
2119	// new style phpass portable hash.
2120	if ( empty($wp_hasher) ) {
2121		// By default, use the portable hash from phpass
2122		$wp_hasher = new PasswordHash(8, true);
2123	}
2124
2125	$check = $wp_hasher->CheckPassword($password, $hash);
2126
2127	/** This filter is documented in wp-includes/pluggable.php */
2128	return apply_filters( 'check_password', $check, $password, $hash, $user_id );
2129}
2130endif;
2131
2132if ( !function_exists('wp_generate_password') ) :
2133/**
2134 * Generates a random password drawn from the defined set of characters.
2135 *
2136 * @since 2.5.0
2137 *
2138 * @param int  $length              Optional. The length of password to generate. Default 12.
2139 * @param bool $special_chars       Optional. Whether to include standard special characters.
2140 *                                  Default true.
2141 * @param bool $extra_special_chars Optional. Whether to include other special characters.
2142 *                                  Used when generating secret keys and salts. Default false.
2143 * @return string The random password.
2144 */
2145function wp_generate_password( $length = 12, $special_chars = true, $extra_special_chars = false ) {
2146	$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
2147	if ( $special_chars )
2148		$chars .= '!@#$%^&*()';
2149	if ( $extra_special_chars )
2150		$chars .= '-_ []{}<>~`+=,.;:/?|';
2151
2152	$password = '';
2153	for ( $i = 0; $i < $length; $i++ ) {
2154		$password .= substr($chars, wp_rand(0, strlen($chars) - 1), 1);
2155	}
2156
2157	/**
2158	 * Filters the randomly-generated password.
2159	 *
2160	 * @since 3.0.0
2161	 *
2162	 * @param string $password The generated password.
2163	 */
2164	return apply_filters( 'random_password', $password );
2165}
2166endif;
2167
2168if ( !function_exists('wp_rand') ) :
2169/**
2170 * Generates a random number
2171 *
2172 * @since 2.6.2
2173 * @since 4.4.0 Uses PHP7 random_int() or the random_compat library if available.
2174 *
2175 * @global string $rnd_value
2176 * @staticvar string $seed
2177 * @staticvar bool $external_rand_source_available
2178 *
2179 * @param int $min Lower limit for the generated number
2180 * @param int $max Upper limit for the generated number
2181 * @return int A random number between min and max
2182 */
2183function wp_rand( $min = 0, $max = 0 ) {
2184	global $rnd_value;
2185
2186	// Some misconfigured 32bit environments (Entropy PHP, for example) truncate integers larger than PHP_INT_MAX to PHP_INT_MAX rather than overflowing them to floats.
2187	$max_random_number = 3000000000 === 2147483647 ? (float) "4294967295" : 4294967295; // 4294967295 = 0xffffffff
2188
2189	// We only handle Ints, floats are truncated to their integer value.
2190	$min = (int) $min;
2191	$max = (int) $max;
2192
2193	// Use PHP's CSPRNG, or a compatible method
2194	static $use_random_int_functionality = true;
2195	if ( $use_random_int_functionality ) {
2196		try {
2197			$_max = ( 0 != $max ) ? $max : $max_random_number;
2198			// wp_rand() can accept arguments in either order, PHP cannot.
2199			$_max = max( $min, $_max );
2200			$_min = min( $min, $_max );
2201			$val = random_int( $_min, $_max );
2202			if ( false !== $val ) {
2203				return absint( $val );
2204			} else {
2205				$use_random_int_functionality = false;
2206			}
2207		} catch ( Error $e ) {
2208			$use_random_int_functionality = false;
2209		} catch ( Exception $e ) {
2210			$use_random_int_functionality = false;
2211		}
2212	}
2213
2214	// Reset $rnd_value after 14 uses
2215	// 32(md5) + 40(sha1) + 40(sha1) / 8 = 14 random numbers from $rnd_value
2216	if ( strlen($rnd_value) < 8 ) {
2217		if ( defined( 'WP_SETUP_CONFIG' ) )
2218			static $seed = '';
2219		else
2220			$seed = get_transient('random_seed');
2221		$rnd_value = md5( uniqid(microtime() . mt_rand(), true ) . $seed );
2222		$rnd_value .= sha1($rnd_value);
2223		$rnd_value .= sha1($rnd_value . $seed);
2224		$seed = md5($seed . $rnd_value);
2225		if ( ! defined( 'WP_SETUP_CONFIG' ) && ! defined( 'WP_INSTALLING' ) ) {
2226			set_transient( 'random_seed', $seed );
2227		}
2228	}
2229
2230	// Take the first 8 digits for our value
2231	$value = substr($rnd_value, 0, 8);
2232
2233	// Strip the first eight, leaving the remainder for the next call to wp_rand().
2234	$rnd_value = substr($rnd_value, 8);
2235
2236	$value = abs(hexdec($value));
2237
2238	// Reduce the value to be within the min - max range
2239	if ( $max != 0 )
2240		$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );
2241
2242	return abs(intval($value));
2243}
2244endif;
2245
2246if ( !function_exists('wp_set_password') ) :
2247/**
2248 * Updates the user's password with a new encrypted one.
2249 *
2250 * For integration with other applications, this function can be overwritten to
2251 * instead use the other package password checking algorithm.
2252 *
2253 * Please note: This function should be used sparingly and is really only meant for single-time
2254 * application. Leveraging this improperly in a plugin or theme could result in an endless loop
2255 * of password resets if precautions are not taken to ensure it does not execute on every page load.
2256 *
2257 * @since 2.5.0
2258 *
2259 * @global wpdb $wpdb WordPress database abstraction object.
2260 *
2261 * @param string $password The plaintext new user password
2262 * @param int    $user_id  User ID
2263 */
2264function wp_set_password( $password, $user_id ) {
2265	global $wpdb;
2266
2267	$hash = wp_hash_password( $password );
2268	$wpdb->update($wpdb->users, array('user_pass' => $hash, 'user_activation_key' => ''), array('ID' => $user_id) );
2269
2270	wp_cache_delete($user_id, 'users');
2271}
2272endif;
2273
2274if ( !function_exists( 'get_avatar' ) ) :
2275/**
2276 * Retrieve the avatar `<img>` tag for a user, email address, MD5 hash, comment, or post.
2277 *
2278 * @since 2.5.0
2279 * @since 4.2.0 Optional `$args` parameter added.
2280 *
2281 * @param mixed $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
2282 *                           user email, WP_User object, WP_Post object, or WP_Comment object.
2283 * @param int    $size       Optional. Height and width of the avatar image file in pixels. Default 96.
2284 * @param string $default    Optional. URL for the default image or a default type. Accepts '404'
2285 *                           (return a 404 instead of a default image), 'retro' (8bit), 'monsterid'
2286 *                           (monster), 'wavatar' (cartoon face), 'indenticon' (the "quilt"),
2287 *                           'mystery', 'mm', or 'mysteryman' (The Oyster Man), 'blank' (transparent GIF),
2288 *                           or 'gravatar_default' (the Gravatar logo). Default is the value of the
2289 *                           'avatar_default' option, with a fallback of 'mystery'.
2290 * @param string $alt        Optional. Alternative text to use in &lt;img&gt; tag. Default empty.
2291 * @param array  $args       {
2292 *     Optional. Extra arguments to retrieve the avatar.
2293 *
2294 *     @type int          $height        Display height of the avatar in pixels. Defaults to $size.
2295 *     @type int          $width         Display width of the avatar in pixels. Defaults to $size.
2296 *     @type bool         $force_default Whether to always show the default image, never the Gravatar. Default false.
2297 *     @type string       $rating        What rating to display avatars up to. Accepts 'G', 'PG', 'R', 'X', and are
2298 *                                       judged in that order. Default is the value of the 'avatar_rating' option.
2299 *     @type string       $scheme        URL scheme to use. See set_url_scheme() for accepted values.
2300 *                                       Default null.
2301 *     @type array|string $class         Array or string of additional classes to add to the &lt;img&gt; element.
2302 *                                       Default null.
2303 *     @type bool         $force_display Whether to always show the avatar - ignores the show_avatars option.
2304 *                                       Default false.
2305 *     @type string       $extra_attr    HTML attributes to insert in the IMG element. Is not sanitized. Default empty.
2306 * }
2307 * @return false|string `<img>` tag for the user's avatar. False on failure.
2308 */
2309function get_avatar( $id_or_email, $size = 96, $default = '', $alt = '', $args = null ) {
2310	$defaults = array(
2311		// get_avatar_data() args.
2312		'size'          => 96,
2313		'height'        => null,
2314		'width'         => null,
2315		'default'       => get_option( 'avatar_default', 'mystery' ),
2316		'force_default' => false,
2317		'rating'        => get_option( 'avatar_rating' ),
2318		'scheme'        => null,
2319		'alt'           => '',
2320		'class'         => null,
2321		'force_display' => false,
2322		'extra_attr'    => '',
2323	);
2324
2325	if ( empty( $args ) ) {
2326		$args = array();
2327	}
2328
2329	$args['size']    = (int) $size;
2330	$args['default'] = $default;
2331	$args['alt']     = $alt;
2332
2333	$args = wp_parse_args( $args, $defaults );
2334
2335	if ( empty( $args['height'] ) ) {
2336		$args['height'] = $args['size'];
2337	}
2338	if ( empty( $args['width'] ) ) {
2339		$args['width'] = $args['size'];
2340	}
2341
2342	if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
2343		$id_or_email = get_comment( $id_or_email );
2344	}
2345
2346	/**
2347	 * Filters whether to retrieve the avatar URL early.
2348	 *
2349	 * Passing a non-null value will effectively short-circuit get_avatar(), passing
2350	 * the value through the {@see 'get_avatar'} filter and returning early.
2351	 *
2352	 * @since 4.2.0
2353	 *
2354	 * @param string $avatar      HTML for the user's avatar. Default null.
2355	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
2356	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
2357	 * @param array  $args        Arguments passed to get_avatar_url(), after processing.
2358	 */
2359	$avatar = apply_filters( 'pre_get_avatar', null, $id_or_email, $args );
2360
2361	if ( ! is_null( $avatar ) ) {
2362		/** This filter is documented in wp-includes/pluggable.php */
2363		return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
2364	}
2365
2366	if ( ! $args['force_display'] && ! get_option( 'show_avatars' ) ) {
2367		return false;
2368	}
2369
2370	$url2x = get_avatar_url( $id_or_email, array_merge( $args, array( 'size' => $args['size'] * 2 ) ) );
2371
2372	$args = get_avatar_data( $id_or_email, $args );
2373
2374	$url = $args['url'];
2375
2376	if ( ! $url || is_wp_error( $url ) ) {
2377		return false;
2378	}
2379
2380	$class = array( 'avatar', 'avatar-' . (int) $args['size'], 'photo' );
2381
2382	if ( ! $args['found_avatar'] || $args['force_default'] ) {
2383		$class[] = 'avatar-default';
2384	}
2385
2386	if ( $args['class'] ) {
2387		if ( is_array( $args['class'] ) ) {
2388			$class = array_merge( $class, $args['class'] );
2389		} else {
2390			$class[] = $args['class'];
2391		}
2392	}
2393
2394	$avatar = sprintf(
2395		"<img alt='%s' src='%s' srcset='%s' class='%s' height='%d' width='%d' %s/>",
2396		esc_attr( $args['alt'] ),
2397		esc_url( $url ),
2398		esc_attr( "$url2x 2x" ),
2399		esc_attr( join( ' ', $class ) ),
2400		(int) $args['height'],
2401		(int) $args['width'],
2402		$args['extra_attr']
2403	);
2404
2405	/**
2406	 * Filters the avatar to retrieve.
2407	 *
2408	 * @since 2.5.0
2409	 * @since 4.2.0 The `$args` parameter was added.
2410	 *
2411	 * @param string $avatar      &lt;img&gt; tag for the user's avatar.
2412	 * @param mixed  $id_or_email The Gravatar to retrieve. Accepts a user_id, gravatar md5 hash,
2413	 *                            user email, WP_User object, WP_Post object, or WP_Comment object.
2414	 * @param int    $size        Square avatar width and height in pixels to retrieve.
2415	 * @param string $alt         Alternative text to use in the avatar image tag.
2416	 *                                       Default empty.
2417	 * @param array  $args        Arguments passed to get_avatar_data(), after processing.
2418	 */
2419	return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
2420}
2421endif;
2422
2423if ( !function_exists( 'wp_text_diff' ) ) :
2424/**
2425 * Displays a human readable HTML representation of the difference between two strings.
2426 *
2427 * The Diff is available for getting the changes between versions. The output is
2428 * HTML, so the primary use is for displaying the changes. If the two strings
2429 * are equivalent, then an empty string will be returned.
2430 *
2431 * The arguments supported and can be changed are listed below.
2432 *
2433 * 'title' : Default is an empty string. Titles the diff in a manner compatible
2434 *		with the output.
2435 * 'title_left' : Default is an empty string. Change the HTML to the left of the
2436 *		title.
2437 * 'title_right' : Default is an empty string. Change the HTML to the right of
2438 *		the title.
2439 *
2440 * @since 2.6.0
2441 *
2442 * @see wp_parse_args() Used to change defaults to user defined settings.
2443 * @uses Text_Diff
2444 * @uses WP_Text_Diff_Renderer_Table
2445 *
2446 * @param string       $left_string  "old" (left) version of string
2447 * @param string       $right_string "new" (right) version of string
2448 * @param string|array $args         Optional. Change 'title', 'title_left', and 'title_right' defaults.
2449 * @return string Empty string if strings are equivalent or HTML with differences.
2450 */
2451function wp_text_diff( $left_string, $right_string, $args = null ) {
2452	$defaults = array( 'title' => '', 'title_left' => '', 'title_right' => '' );
2453	$args = wp_parse_args( $args, $defaults );
2454
2455	if ( ! class_exists( 'WP_Text_Diff_Renderer_Table', false ) )
2456		require( ABSPATH . WPINC . '/wp-diff.php' );
2457
2458	$left_string  = normalize_whitespace($left_string);
2459	$right_string = normalize_whitespace($right_string);
2460
2461	$left_lines  = explode("\n", $left_string);
2462	$right_lines = explode("\n", $right_string);
2463	$text_diff = new Text_Diff($left_lines, $right_lines);
2464	$renderer  = new WP_Text_Diff_Renderer_Table( $args );
2465	$diff = $renderer->render($text_diff);
2466
2467	if ( !$diff )
2468		return '';
2469
2470	$r  = "<table class='diff'>\n";
2471
2472	if ( ! empty( $args[ 'show_split_view' ] ) ) {
2473		$r .= "<col class='content diffsplit left' /><col class='content diffsplit middle' /><col class='content diffsplit right' />";
2474	} else {
2475		$r .= "<col class='content' />";
2476	}
2477
2478	if ( $args['title'] || $args['title_left'] || $args['title_right'] )
2479		$r .= "<thead>";
2480	if ( $args['title'] )
2481		$r .= "<tr class='diff-title'><th colspan='4'>$args[title]</th></tr>\n";
2482	if ( $args['title_left'] || $args['title_right'] ) {
2483		$r .= "<tr class='diff-sub-title'>\n";
2484		$r .= "\t<td></td><th>$args[title_left]</th>\n";
2485		$r .= "\t<td></td><th>$args[title_right]</th>\n";
2486		$r .= "</tr>\n";
2487	}
2488	if ( $args['title'] || $args['title_left'] || $args['title_right'] )
2489		$r .= "</thead>\n";
2490
2491	$r .= "<tbody>\n$diff\n</tbody>\n";
2492	$r .= "</table>";
2493
2494	return $r;
2495}
2496endif;