<?php
/**
* 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.
*
* @package PHP
* @access private
*/
// If gettext isn't available.
if ( ! function_exists( '_' ) ) {
function _( $message ) {
return $message;
}
}
/**
* Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.
*
* @ignore
* @since 4.2.2
* @access private
*
* @param bool $set - Used for testing only
* null : default - get PCRE/u capability
* false : Used for testing - return false for future calls to this function
* 'reset': Used for testing - restore default behavior of this function
*/
function _wp_can_use_pcre_u( $set = null ) {
static $utf8_pcre = 'reset';
if ( null !== $set ) {
$utf8_pcre = $set;
}
if ( 'reset' === $utf8_pcre ) {
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- intentional error generated to detect PCRE/u support.
$utf8_pcre = @preg_match( '/^./u', 'a' );
}
return $utf8_pcre;
}
/**
* Indicates if a given slug for a character set represents the UTF-8 text encoding.
*
* A charset is considered to represent UTF-8 if it is a case-insensitive match
* of "UTF-8" with or without the hyphen.
*
* Example:
*
* true === _is_utf8_charset( 'UTF-8' );
* true === _is_utf8_charset( 'utf8' );
* false === _is_utf8_charset( 'latin1' );
* false === _is_utf8_charset( 'UTF 8' );
*
* // Only strings match.
* false === _is_utf8_charset( [ 'charset' => 'utf-8' ] );
*
* `is_utf8_charset` should be used outside of this file.
*
* @ignore
* @since 6.6.1
*
* @param string $charset_slug Slug representing a text character encoding, or "charset".
* E.g. "UTF-8", "Windows-1252", "ISO-8859-1", "SJIS".
*
* @return bool Whether the slug represents the UTF-8 encoding.
*/
function _is_utf8_charset( $charset_slug ) {
if ( ! is_string( $charset_slug ) ) {
return false;
}
return (
0 === strcasecmp( 'UTF-8', $charset_slug ) ||
0 === strcasecmp( 'UTF8', $charset_slug )
);
}
if ( ! function_exists( 'mb_substr' ) ) :
/**
* Compat function to mimic mb_substr().
*
* @ignore
* @since 3.2.0
*
* @see _mb_substr()
*
* @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`.
* Default null.
* @param string|null $encoding Optional. Character encoding to use. Default null.
* @return string Extracted substring.
*/
function mb_substr( $string, $start, $length = null, $encoding = null ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound
return _mb_substr( $string, $start, $length, $encoding );
}
endif;
/**
* Internal compat function to mimic mb_substr().
*
* Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
* For `$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.
*
* @ignore
* @since 3.2.0
*
* @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`.
* Default null.
* @param string|null $encoding Optional. Character encoding to use. Default null.
* @return string Extracted substring.
*/
function _mb_substr( $str, $start, $length = null, $encoding = null ) {
if ( null === $str ) {
return '';
}
if ( null === $encoding ) {
$encoding = get_option( 'blog_charset' );
}
/*
* The solution below works only for UTF-8, so in case of a different
* charset just use built-in substr().
*/
if ( ! _is_utf8_charset( $encoding ) ) {
return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length );
}
if ( _wp_can_use_pcre_u() ) {
// Use the regex unicode support to separate the UTF-8 characters into an array.
preg_match_all( '/./us', $str, $match );
$chars = is_null( $length ) ? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
return implode( '', $chars );
}
$regex = '/(
[\x00-\x7F] # single-byte sequences 0xxxxxxx
| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
| [\xE1-\xEC][\x80-\xBF]{2}
| \xED[\x80-\x9F][\x80-\xBF]
| [\xEE-\xEF][\x80-\xBF]{2}
| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
| [\xF1-\xF3][\x80-\xBF]{3}
| \xF4[\x80-\x8F][\x80-\xBF]{2}
)/x';
// Start with 1 element instead of 0 since the first thing we do is pop.
$chars = array( '' );
do {
// We had some string left over from the last round, but we counted it in that last round.
array_pop( $chars );
/*
* Split by UTF-8 character, limit to 1000 characters (last array element will contain
* the rest of the string).
*/
$pieces = preg_split( $regex, $str, 1000, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
$chars = array_merge( $chars, $pieces );
// If there's anything left over, repeat the loop.
} while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) );
return implode( '', array_slice( $chars, $start, $length ) );
}
if ( ! function_exists( 'mb_strlen' ) ) :
/**
* Compat function to mimic mb_strlen().
*
* @ignore
* @since 4.2.0
*
* @see _mb_strlen()
*
* @param string $string The string to retrieve the character length from.
* @param string|null $encoding Optional. Character encoding to use. Default null.
* @return int String length of `$string`.
*/
function mb_strlen( $string, $encoding = null ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound
return _mb_strlen( $string, $encoding );
}
endif;
/**
* Internal compat function to mimic mb_strlen().
*
* Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
* For `$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.
*
* @ignore
* @since 4.2.0
*
* @param string $str The string to retrieve the character length from.
* @param string|null $encoding Optional. Character encoding to use. Default null.
* @return int String length of `$str`.
*/
function _mb_strlen( $str, $encoding = null ) {
if ( null === $encoding ) {
$encoding = get_option( 'blog_charset' );
}
/*
* The solution below works only for UTF-8, so in case of a different charset
* just use built-in strlen().
*/
if ( ! _is_utf8_charset( $encoding ) ) {
return strlen( $str );
}
if ( _wp_can_use_pcre_u() ) {
// Use the regex unicode support to separate the UTF-8 characters into an array.
preg_match_all( '/./us', $str, $match );
return count( $match[0] );
}
$regex = '/(?:
[\x00-\x7F] # single-byte sequences 0xxxxxxx
| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
| [\xE1-\xEC][\x80-\xBF]{2}
| \xED[\x80-\x9F][\x80-\xBF]
| [\xEE-\xEF][\x80-\xBF]{2}
| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
| [\xF1-\xF3][\x80-\xBF]{3}
| \xF4[\x80-\x8F][\x80-\xBF]{2}
)/x';
// Start at 1 instead of 0 since the first thing we do is decrement.
$count = 1;
do {
// We had some string left over from the last round, but we counted it in that last round.
--$count;
/*
* Split by UTF-8 character, limit to 1000 characters (last array element will contain
* the rest of the string).
*/
$pieces = preg_split( $regex, $str, 1000 );
// Increment.
$count += count( $pieces );
// If there's anything left over, repeat the loop.
} while ( $str = array_pop( $pieces ) );
// Fencepost: preg_split() always returns one extra item in the array.
return --$count;
}
// sodium_crypto_box() was introduced in PHP 7.2.
if ( ! function_exists( 'sodium_crypto_box' ) ) {
require ABSPATH . WPINC . '/sodium_compat/autoload.php';
}
if ( ! function_exists( 'is_countable' ) ) {
/**
* 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.
*
* @since 4.9.6
*
* @param mixed $value The value to check.
* @return bool True if `$value` is countable, false otherwise.
*/
function is_countable( $value ) {
return ( is_array( $value )
|| $value instanceof Countable
|| $value instanceof SimpleXMLElement
|| $value instanceof ResourceBundle
);
}
}
if ( ! function_exists( 'array_key_first' ) ) {
/**
* 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.
*
* @since 5.9.0
*
* @param array $array An array.
* @return string|int|null The first key of array if the array
* is not empty; `null` otherwise.
*/
function array_key_first( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
if ( empty( $array ) ) {
return null;
}
foreach ( $array as $key => $value ) {
return $key;
}
}
}
if ( ! function_exists( 'array_key_last' ) ) {
/**
* 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.
*
* @since 5.9.0
*
* @param array $array An array.
* @return string|int|null The last key of array if the array
*. is not empty; `null` otherwise.
*/
function array_key_last( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
if ( empty( $array ) ) {
return null;
}
end( $array );
return key( $array );
}
}
if ( ! function_exists( 'array_is_list' ) ) {
/**
* Polyfill for `array_is_list()` function added in PHP 8.1.
*
* Determines if the given array is a list.
*
* An array is considered a list if its keys consist of consecutive numbers from 0 to count($array)-1.
*
* @see https://github.com/symfony/polyfill-php81/tree/main
*
* @since 6.5.0
*
* @param array<mixed> $arr The array being evaluated.
* @return bool True if array is a list, false otherwise.
*/
function array_is_list( $arr ) {
if ( ( array() === $arr ) || ( array_values( $arr ) === $arr ) ) {
return true;
}
$next_key = -1;
foreach ( $arr as $k => $v ) {
if ( ++$next_key !== $k ) {
return false;
}
}
return true;
}
}
if ( ! function_exists( 'str_contains' ) ) {
/**
* Polyfill for `str_contains()` function added in PHP 8.0.
*
* Performs a case-sensitive check indicating if needle is
* contained in haystack.
*
* @since 5.9.0
*
* @param string $haystack The string to search in.
* @param string $needle The substring to search for in the `$haystack`.
* @return bool True if `$needle` is in `$haystack`, otherwise false.
*/
function str_contains( $haystack, $needle ) {
if ( '' === $needle ) {
return true;
}
return false !== strpos( $haystack, $needle );
}
}
if ( ! function_exists( 'str_starts_with' ) ) {
/**
* Polyfill for `str_starts_with()` function added in PHP 8.0.
*
* Performs a case-sensitive check indicating if
* the haystack begins with needle.
*
* @since 5.9.0
*
* @param string $haystack The string to search in.
* @param string $needle The substring to search for in the `$haystack`.
* @return bool True if `$haystack` starts with `$needle`, otherwise false.
*/
function str_starts_with( $haystack, $needle ) {
if ( '' === $needle ) {
return true;
}
return 0 === strpos( $haystack, $needle );
}
}
if ( ! function_exists( 'str_ends_with' ) ) {
/**
* Polyfill for `str_ends_with()` function added in PHP 8.0.
*
* Performs a case-sensitive check indicating if
* the haystack ends with needle.
*
* @since 5.9.0
*
* @param string $haystack The string to search in.
* @param string $needle The substring to search for in the `$haystack`.
* @return bool True if `$haystack` ends with `$needle`, otherwise false.
*/
function str_ends_with( $haystack, $needle ) {
if ( '' === $haystack ) {
return '' === $needle;
}
$len = strlen( $needle );
return substr( $haystack, -$len, $len ) === $needle;
}
}
if ( ! function_exists( 'array_find' ) ) {
/**
* Polyfill for `array_find()` function added in PHP 8.4.
*
* Searches an array for the first element that passes a given callback.
*
* @since 6.8.0
*
* @param array $array The array to search.
* @param callable $callback The callback to run for each element.
* @return mixed|null The first element in the array that passes the `$callback`, otherwise null.
*/
function array_find( array $array, callable $callback ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
foreach ( $array as $key => $value ) {
if ( $callback( $value, $key ) ) {
return $value;
}
}
return null;
}
}
if ( ! function_exists( 'array_find_key' ) ) {
/**
* Polyfill for `array_find_key()` function added in PHP 8.4.
*
* Searches an array for the first key that passes a given callback.
*
* @since 6.8.0
*
* @param array $array The array to search.
* @param callable $callback The callback to run for each element.
* @return int|string|null The first key in the array that passes the `$callback`, otherwise null.
*/
function array_find_key( array $array, callable $callback ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
foreach ( $array as $key => $value ) {
if ( $callback( $value, $key ) ) {
return $key;
}
}
return null;
}
}
if ( ! function_exists( 'array_any' ) ) {
/**
* Polyfill for `array_any()` function added in PHP 8.4.
*
* Checks if any element of an array passes a given callback.
*
* @since 6.8.0
*
* @param array $array The array to check.
* @param callable $callback The callback to run for each element.
* @return bool True if any element in the array passes the `$callback`, otherwise false.
*/
function array_any( array $array, callable $callback ): bool { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
foreach ( $array as $key => $value ) {
if ( $callback( $value, $key ) ) {
return true;
}
}
return false;
}
}
if ( ! function_exists( 'array_all' ) ) {
/**
* Polyfill for `array_all()` function added in PHP 8.4.
*
* Checks if all elements of an array pass a given callback.
*
* @since 6.8.0
*
* @param array $array The array to check.
* @param callable $callback The callback to run for each element.
* @return bool True if all elements in the array pass the `$callback`, otherwise false.
*/
function array_all( array $array, callable $callback ): bool { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
foreach ( $array as $key => $value ) {
if ( ! $callback( $value, $key ) ) {
return false;
}
}
return true;
}
}
// IMAGETYPE_AVIF constant is only defined in PHP 8.x or later.
if ( ! defined( 'IMAGETYPE_AVIF' ) ) {
define( 'IMAGETYPE_AVIF', 19 );
}
// IMG_AVIF constant is only defined in PHP 8.x or later.
if ( ! defined( 'IMG_AVIF' ) ) {
define( 'IMG_AVIF', IMAGETYPE_AVIF );
}
// IMAGETYPE_HEIC constant is not yet defined in PHP as of PHP 8.3.
if ( ! defined( 'IMAGETYPE_HEIC' ) ) {
define( 'IMAGETYPE_HEIC', 99 );
}
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