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1a
2
3abs - Absolute value
4acos - Arc cosine
5acosh - Inverse hyperbolic cosine
6addcslashes - Quote string with slashes in a C style
7addslashes - Quote string with slashes
8array - Create an array
9arsort - Sort an array in reverse order and maintain index association
10asin - Arc sine
11asinh - Inverse hyperbolic sine
12asort - Sort an array and maintain index association
13assert - Checks if assertion is FALSE
14atan - Arc tangent
15atan2 - Arc tangent of two variables
16atanh - Inverse hyperbolic tangent
17b
18bcadd - Add two arbitrary precision numbers
19bcdiv - Divide two arbitrary precision numbers
20bcpow - Raise an arbitrary precision number to another
21bcscale - Set default scale parameter for all bc math functions
22bcsqrt - Get the square root of an arbitrary precision number
23bcsub - Subtract one arbitrary precision number from another
24bin2hex - Convert binary data into hexadecimal representation
25bindec - Binary to decimal
26boolval - Get the boolean value of a variable
27bzclose - Close a bzip2 file
28bzerrno - Returns a bzip2 error number
29bzerror - Returns the bzip2 error number and error string in an array
30bzerrstr - Returns a bzip2 error string
31bzflush - Force a write of all buffered data
32bzopen - Opens a bzip2 compressed file
33bzread - Binary safe bzip2 file read
34bzwrite - Binary safe bzip2 file write
35c
36ceil - Round fractions up
37chdir - Change directory
38checkdate - Validate a Gregorian date
39checkdnsrr - Check DNS records corresponding to a given Internet host name or IP address
40chgrp - Changes file group
41chop - Alias of rtrim
42chown - Changes file owner
43
44chr - Generate a single-byte string from a number
45
46chroot - Change the root directory
47clearstatcache - Clears file status cache
48closedir - Close directory handle
49closelog - Close connection to system logger
50constant - Returns the value of a constant
51copy - Copies file
52cos - Cosine
53cosh - Hyperbolic cosine
54count - Count all elements in an array, or something in an object
55crc32 - Calculates the crc32 polynomial of a string
56crypt - One-way string hashing
57CURL context options - CURL context option listing
58current - Return the current element in an array
59d
60data:// - Data (RFC 2397)
61date - Format a local time/date
62decbin - Decimal to binary
63dechex - Decimal to hexadecimal
64decoct - Decimal to octal
65define - Defines a named constant
66defined - Checks whether a given named constant exists
67deg2rad - Converts the number in degrees to the radian equivalent
68delete - See unlink or unset
69die - Equivalent to exit
70dir - Return an instance of the Directory class
71dl - Loads a PHP extension at runtime
72doubleval - Alias of floatval
73e
74each - Return the current key and value pair from an array and advance the array cursor
75echo - Output one or more strings
76end - Set the internal pointer of an array to its last element
77ereg - Regular expression match
78eregi - Case insensitive regular expression match
79escapeshellarg - Escape a string to be used as a shell argument
80eval - Evaluate a string as PHP code
81exec - Execute an external program
82exit - Output a message and terminate the current script
83exp - Calculates the exponent of e
84expect:// - Process Interaction Streams
85explode - Split a string by a string
86expression - Bind prepared statement variables as parameters
87extract - Import variables into the current symbol table from an array
88f
89fclose - Closes an open file pointer
90feof - Tests for end-of-file on a file pointer
91fflush - Flushes the output to a file
92file - Reads entire file into an array
93file:// - Accessing local filesystem
94filegroup - Gets file group
95fileinode - Gets file inode
96fileowner - Gets file owner
97filepro - Read and verify the map file
98filesize - Gets file size
99filetype - Gets file type
100floatval - Get float value of a variable
101flock - Portable advisory file locking
102floor - Round fractions down
103flush - Flush system output buffer
104fopen - Opens file or URL
105fpassthru - Output all remaining data on a file pointer
106fprintf - Write a formatted string to a stream
107fputcsv - Format line as CSV and write to file pointer
108fputs - Alias of fwrite
109fread - Binary-safe file read
110frenchtojd - Converts a date from the French Republican Calendar to a Julian Day Count
111fscanf - Parses input from a file according to a format
112fseek - Seeks on a file pointer
113fsockopen - Open Internet or Unix domain socket connection
114fstat - Gets information about a file using an open file pointer
115ftell - Returns the current position of the file read/write pointer
116ftok - Convert a pathname and a project identifier to a System V IPC key
117ftp:// - Accessing FTP(s) URLs
118FTP context options - FTP context option listing
119ftruncate - Truncates a file to a given length
120fwrite - Binary-safe file write
121g
122glob - Find pathnames matching a pattern
123glob:// - Find pathnames matching pattern
124gregoriantojd - Converts a Gregorian date to Julian Day Count
125gzclose - Close an open gz-file pointer
126gzdecode - Decodes a gzip compressed string
127gzdeflate - Deflate a string
128gzencode - Create a gzip compressed string
129gzeof - Test for EOF on a gz-file pointer
130gzfile - Read entire gz-file into an array
131gzinflate - Inflate a deflated string
132gzopen - Open gz-file
133gzpassthru - Output all remaining data on a gz-file pointer
134gzputs - Alias of gzwrite
135gzread - Binary-safe gz-file read
136gzrewind - Rewind the position of a gz-file pointer
137gzseek - Seek on a gz-file pointer
138gztell - Tell gz-file pointer read/write position
139gzwrite - Binary-safe gz-file write
140h
141hash - Generate a hash value (message digest)
142header - Send a raw HTTP header
143hebrev - Convert logical Hebrew text to visual text
144hebrevc - Convert logical Hebrew text to visual text with newline conversion
145
146
147hex2bin - Decodes a hexadecimally encoded binary string
148hexdec - Hexadecimal to decimal
149
150http:// - Accessing HTTP(s) URLs
151HTTP context options - HTTP context option listing
152hypot - Calculate the length of the hypotenuse of a right-angle triangle
153i
154iconv - Convert string to requested character encoding
155idate - Format a local time/date as integer
156intdiv - Integer division
157intval - Get the integer value of a variable
158ip2long - Converts a string containing an (IPv4) Internet Protocol dotted address into a long integer
159iptcparse - Parse a binary IPTC block into single tags
160isset - Determine if a variable is set and is not NULL
161j
162jddayofweek - Returns the day of the week
163jdtofrench - Converts a Julian Day Count to the French Republican Calendar
164jdtogregorian - Converts Julian Day Count to Gregorian date
165jdtojewish - Converts a Julian day count to a Jewish calendar date
166jdtojulian - Converts a Julian Day Count to a Julian Calendar Date
167jdtounix - Convert Julian Day to Unix timestamp
168jewishtojd - Converts a date in the Jewish Calendar to Julian Day Count
169join - Alias of implode
170juliantojd - Converts a Julian Calendar date to Julian Day Count
171k
172key - Fetch a key from an array
173krsort - Sort an array by key in reverse order
174ksort - Sort an array by key
175l
176lcfirst - Make a string's first character lowercase
177lchgrp - Changes group ownership of symlink
178lchown - Changes user ownership of symlink
179levenshtein - Calculate Levenshtein distance between two strings
180link - Create a hard link
181list - Assign variables as if they were an array
182localeconv - Get numeric formatting information
183log - Natural logarithm
184
185log1p - Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
186log10 - Base-10 logarithm
187
188long2ip - Converts an long integer address into a string in (IPv4) Internet standard dotted format
189lstat - Gives information about a file or symbolic link
190m
191n
192natcasesort - Sort an array using a case insensitive "natural order" algorithm
193natsort - Sort an array using a "natural order" algorithm
194next - Advance the internal pointer of an array
195nl2br - Inserts HTML line breaks before all newlines in a string
196o
197ocicloselob - Alias of OCI-Lob::close
198ocicollappend - Alias of OCI-Collection::append
199ocicollassign - Alias of OCI-Collection::assign
200ocicollsize - Alias of OCI-Collection::size
201ocifreecollection - Alias of OCI-Collection::free
202ocifreedesc - Alias of OCI-Lob::free
203ociloadlob - Alias of OCI-Lob::load
204ocisavelob - Alias of OCI-Lob::save
205ocisavelobfile - Alias of OCI-Lob::import
206ociwritelobtofile - Alias of OCI-Lob::export
207octdec - Octal to decimal
208ogg:// - Audio streams
209opendir - Open directory handle
210openlog - Open connection to system logger
211ord - Convert the first byte of a string to a value between 0 and 255
212p
213pack - Pack data into binary string
214passthru - Execute an external program and display raw output
215pclose - Closes process file pointer
216pfsockopen - Open persistent Internet or Unix domain socket connection
217phar:// - PHP Archive
218Phar context options - Phar context option listing
219PharException - The PharException class provides a phar-specific exception class for try/catch blocks
220php:// - Accessing various I/O streams
221phpcredits - Prints out the credits for PHP
222phpversion - Gets the current PHP version
223pi - Get value of pi
224popen - Opens process file pointer
225pos - Alias of current
226pow - Exponential expression
227prev - Rewind the internal array pointer
228print - Output a string
229printf - Output a formatted string
230putenv - Sets the value of an environment variable
231q
232r
233rad2deg - Converts the radian number to the equivalent number in degrees
234range - Create an array containing a range of elements
235rar:// - RAR
236rawurldecode - Decode URL-encoded strings
237rawurlencode - URL-encode according to RFC 3986
238readdir - Read entry from directory handle
239readfile - Outputs a file
240readgzfile - Output a gz-file
241readline - Reads a line
242readlink - Returns the target of a symbolic link
243realpath - Returns canonicalized absolute pathname
244reset - Set the internal pointer of an array to its first element
245rewind - Rewind the position of a file pointer
246rewinddir - Rewind directory handle
247round - Rounds a float
248rsort - Sort an array in reverse order
249s
250scandir - List files and directories inside the specified path
251serialize - Generates a storable representation of a value
252setcookie - Send a cookie
253setlocale - Set locale information
254setproctitle - Set the process title
255setrawcookie - Send a cookie without urlencoding the cookie value
256setthreadtitle - Set the thread title
257settype - Set the type of a variable
258sha1 - Calculate the sha1 hash of a string
259shuffle - Shuffle an array
260sin - Sine
261sinh - Hyperbolic sine
262sizeof - Alias of count
263sleep - Delay execution
264Socket context options - Socket context option listing
265sort - Sort an array
266soundex - Calculate the soundex key of a string
267split - Split string into array by regular expression
268spliti - Split string into array by regular expression case insensitive
269sprintf - Return a formatted string
270SQL acceptable by 4D - PDO and SQL 4D
271sqrt - Square root
272sscanf - Parses input from a string according to a format
273ssh2:// - Secure Shell 2
274SSL context options - SSL context option listing
275stat - Gives information about a file
276strchr - Alias of strstr
277strcoll - Locale based string comparison
278strcspn - Find length of initial segment not matching mask
279stripcslashes - Un-quote string quoted with addcslashes
280stripos - Find the position of the first occurrence of a case-insensitive substring in a string
281stripslashes - Un-quotes a quoted string
282stristr - Case-insensitive strstr
283strlen - Get string length
284strpbrk - Search a string for any of a set of characters
285strpos - Find the position of the first occurrence of a substring in a string
286strrchr - Find the last occurrence of a character in a string
287strrev - Reverse a string
288strripos - Find the position of the last occurrence of a case-insensitive substring in a string
289strrpos - Find the position of the last occurrence of a substring in a string
290strspn - Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask
291strstr - Find the first occurrence of a string
292strtok - Tokenize string
293strtolower - Make a string lowercase
294strtoupper - Make a string uppercase
295strtr - Translate characters or replace substrings
296strval - Get string value of a variable
297t
298taint - Taint a string
299tan - Tangent
300tanh - Hyperbolic tangent
301touch - Sets access and modification time of file
302u
303uasort - Sort an array with a user-defined comparison function and maintain index association
304ucfirst - Make a string's first character uppercase
305ucwords - Uppercase the first character of each word in a string
306UI\quit - Quit UI Loop
307UI\run - Enter UI Loop
308uksort - Sort an array by keys using a user-defined comparison function
309uniqid - Generate a unique ID
310unixtojd - Convert Unix timestamp to Julian Day
311unlink - Deletes a file
312unpack - Unpack data from binary string
313unserialize - Creates a PHP value from a stored representation
314unset - Unset a given variable
315untaint - Untaint strings
316urldecode - Decodes URL-encoded string
317urlencode - URL-encodes string
318usleep - Delay execution in microseconds
319usort - Sort an array by values using a user-defined comparison function
320v
321vfprintf - Write a formatted string to a stream
322virtual - Perform an Apache sub-request
323vprintf - Output a formatted string
324vsprintf - Return a formatted string
325w
326wordwrap - Wraps a string to a given number of characters
327x
328y
329z
330Zip context options - Zip context option listing
331zlib:// - Compression Streams
332__halt_compiler - Halts the compiler execution