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/wp-includes/ -> compat.php (summary)

WordPress implementation for PHP functions either missing from older PHP versions or not included by default. This file is loaded extremely early and the functions can be relied upon by drop-ins. Ergo, please ensure you do not rely on external functions when writing code for this file. Only use functions built into PHP or are defined in this file and have adequate testing and error suppression to ensure the file will run correctly and not break websites.

File Size: 617 lines (18 kb)
Included or required:0 times
Referenced: 0 times
Includes or requires: 1 file
 wp-includes/sodium_compat/autoload.php

Defines 20 functions

  _()
  _wp_can_use_pcre_u()
  _is_utf8_charset()
  mb_substr()
  _mb_substr()
  mb_strlen()
  _mb_strlen()
  is_countable()
  array_key_first()
  array_key_last()
  array_is_list()
  str_contains()
  str_starts_with()
  str_ends_with()
  array_find()
  array_find_key()
  array_any()
  array_all()
  array_first()
  array_last()

Functions
Functions that are not part of a class:

_( $message )   X-Ref
Compat function to mimic _(), an alias of gettext().

return: string
param: string $message The message being translated.

_wp_can_use_pcre_u( $set = null )   X-Ref
Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.

param: bool $set - Used for testing only

_is_utf8_charset( $charset_slug )   X-Ref
No description

mb_substr( $string, $start, $length = null, $encoding = null )   X-Ref
Compat function to mimic mb_substr().

return: string Extracted substring.
param: string      $string   The string to extract the substring from.
param: int         $start    Position to being extraction from in `$string`.
param: int|null    $length   Optional. Maximum number of characters to extract from `$string`.
param: string|null $encoding Optional. Character encoding to use. Default null.

_mb_substr( $str, $start, $length = null, $encoding = null )   X-Ref
Internal compat function to mimic mb_substr().

Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
For `$encoding === UTF-8`, the `$str` input is expected to be a valid UTF-8 byte
sequence. The behavior of this function for invalid inputs is undefined.

return: string Extracted substring.
param: string      $str      The string to extract the substring from.
param: int         $start    Position to being extraction from in `$str`.
param: int|null    $length   Optional. Maximum number of characters to extract from `$str`.
param: string|null $encoding Optional. Character encoding to use. Default null.

mb_strlen( $string, $encoding = null )   X-Ref
Compat function to mimic mb_strlen().

return: int String length of `$string`.
param: string      $string   The string to retrieve the character length from.
param: string|null $encoding Optional. Character encoding to use. Default null.

_mb_strlen( $str, $encoding = null )   X-Ref
Internal compat function to mimic mb_strlen().

Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
For `$encoding === UTF-8`, the `$str` input is expected to be a valid UTF-8 byte
sequence. The behavior of this function for invalid inputs is undefined.

return: int String length of `$str`.
param: string      $str      The string to retrieve the character length from.
param: string|null $encoding Optional. Character encoding to use. Default null.

is_countable( $value )   X-Ref
Polyfill for is_countable() function added in PHP 7.3.

Verify that the content of a variable is an array or an object
implementing the Countable interface.

return: bool True if `$value` is countable, false otherwise.
param: mixed $value The value to check.

array_key_first( array $array )   X-Ref
Polyfill for array_key_first() function added in PHP 7.3.

Get the first key of the given array without affecting
the internal array pointer.

return: string|int|null The first key of array if the array
param: array $array An array.

array_key_last( array $array )   X-Ref
Polyfill for `array_key_last()` function added in PHP 7.3.

Get the last key of the given array without affecting the
internal array pointer.

return: string|int|null The last key of array if the array
param: array $array An array.

array_is_list( $arr )   X-Ref
Polyfill for `array_is_list()` function added in PHP 8.1.

Determines if the given array is a list.

An array is considered a list if its keys consist of consecutive numbers from 0 to count($array)-1.

return: bool True if array is a list, false otherwise.
param: array<mixed> $arr The array being evaluated.

str_contains( $haystack, $needle )   X-Ref
Polyfill for `str_contains()` function added in PHP 8.0.

Performs a case-sensitive check indicating if needle is
contained in haystack.

return: bool True if `$needle` is in `$haystack`, otherwise false.
param: string $haystack The string to search in.
param: string $needle   The substring to search for in the `$haystack`.

str_starts_with( $haystack, $needle )   X-Ref
Polyfill for `str_starts_with()` function added in PHP 8.0.

Performs a case-sensitive check indicating if
the haystack begins with needle.

return: bool True if `$haystack` starts with `$needle`, otherwise false.
param: string $haystack The string to search in.
param: string $needle   The substring to search for in the `$haystack`.

str_ends_with( $haystack, $needle )   X-Ref
Polyfill for `str_ends_with()` function added in PHP 8.0.

Performs a case-sensitive check indicating if
the haystack ends with needle.

return: bool True if `$haystack` ends with `$needle`, otherwise false.
param: string $haystack The string to search in.
param: string $needle   The substring to search for in the `$haystack`.

array_find( array $array, callable $callback )   X-Ref
Polyfill for `array_find()` function added in PHP 8.4.

Searches an array for the first element that passes a given callback.

return: mixed|null The first element in the array that passes the `$callback`, otherwise null.
param: array    $array    The array to search.
param: callable $callback The callback to run for each element.

array_find_key( array $array, callable $callback )   X-Ref
Polyfill for `array_find_key()` function added in PHP 8.4.

Searches an array for the first key that passes a given callback.

return: int|string|null The first key in the array that passes the `$callback`, otherwise null.
param: array    $array    The array to search.
param: callable $callback The callback to run for each element.

array_any( array $array, callable $callback )   X-Ref
Polyfill for `array_any()` function added in PHP 8.4.

Checks if any element of an array passes a given callback.

return: bool True if any element in the array passes the `$callback`, otherwise false.
param: array    $array    The array to check.
param: callable $callback The callback to run for each element.

array_all( array $array, callable $callback )   X-Ref
Polyfill for `array_all()` function added in PHP 8.4.

Checks if all elements of an array pass a given callback.

return: bool True if all elements in the array pass the `$callback`, otherwise false.
param: array    $array    The array to check.
param: callable $callback The callback to run for each element.

array_first( array $array )   X-Ref
Polyfill for `array_first()` function added in PHP 8.5.

Returns the first element of an array.

return: mixed|null The first element of the array, or null if the array is empty.
param: array $array The array to get the first element from.

array_last( array $array )   X-Ref
Polyfill for `array_last()` function added in PHP 8.5.

Returns the last element of an array.

return: mixed|null The last element of the array, or null if the array is empty.
param: array $array The array to get the last element from.



Generated : Tue Sep 9 08:20:04 2025 Cross-referenced by PHPXref