4e917ba2ef
The `utf8_encode()` and `utf8_decode()` functions were deprecated in PHP 8.2.0 and will be removed in PHP 9.0. When that happens, any existing code which calls them will trigger a crash. This patch introduces polyfills for those functions when they aren’t already present. The polyfill functions maintain backwards compatibility, including a deprecation notice. Any code calling either of these functions ought to be refactored to avoid using them; there are better options which don’t carry the issues these functions do, and any code calling them is likely calling them inappropriately. Developed in https://github.com/WordPress/wordpress-develop/pull/10011 Discussed in https://core.trac.wordpress.org/ticket/55603 Discussed in https://core.trac.wordpress.org/ticket/63863 See #63863. Built from https://develop.svn.wordpress.org/trunk@60950 git-svn-id: http://core.svn.wordpress.org/trunk@60286 1a063a9b-81f0-0310-95a4-ce76da25c4cd
640 lines
18 KiB
PHP
640 lines
18 KiB
PHP
<?php
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/**
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* WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
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*
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* This file is loaded extremely early and the functions can be relied upon by drop-ins.
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* Ergo, please ensure you do not rely on external functions when writing code for this file.
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* Only use functions built into PHP or are defined in this file and have adequate testing
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* and error suppression to ensure the file will run correctly and not break websites.
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*
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* @package PHP
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* @access private
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*/
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// If gettext isn't available.
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if ( ! function_exists( '_' ) ) {
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/**
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* Compat function to mimic _(), an alias of gettext().
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*
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* @since 0.71
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*
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* @see https://php.net/manual/en/function.gettext.php
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*
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* @param string $message The message being translated.
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* @return string
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*/
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function _( $message ) {
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return $message;
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}
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}
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/**
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* Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.
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*
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* @ignore
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* @since 4.2.2
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* @access private
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*
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* @param bool $set - Used for testing only
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* null : default - get PCRE/u capability
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* false : Used for testing - return false for future calls to this function
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* 'reset': Used for testing - restore default behavior of this function
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*/
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function _wp_can_use_pcre_u( $set = null ) {
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static $utf8_pcre = 'reset';
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if ( null !== $set ) {
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$utf8_pcre = $set;
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}
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if ( 'reset' === $utf8_pcre ) {
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$utf8_pcre = true;
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set_error_handler(
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function ( $errno, $errstr ) use ( &$utf8_pcre ) {
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if ( str_starts_with( $errstr, 'preg_match():' ) ) {
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$utf8_pcre = false;
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return true;
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}
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return false;
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},
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E_WARNING
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);
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/*
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* Attempt to compile a PCRE pattern with the PCRE_UTF8 flag. For
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* systems lacking Unicode support this will trigger a warning
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* during compilation, which the error handler will intercept.
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*/
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preg_match( '//u', '' );
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restore_error_handler();
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}
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return $utf8_pcre;
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}
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/**
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* Indicates if a given slug for a character set represents the UTF-8 text encoding.
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*
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* A charset is considered to represent UTF-8 if it is a case-insensitive match
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* of "UTF-8" with or without the hyphen.
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*
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* Example:
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*
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* true === _is_utf8_charset( 'UTF-8' );
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* true === _is_utf8_charset( 'utf8' );
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* false === _is_utf8_charset( 'latin1' );
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* false === _is_utf8_charset( 'UTF 8' );
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*
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* // Only strings match.
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* false === _is_utf8_charset( [ 'charset' => 'utf-8' ] );
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*
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* `is_utf8_charset` should be used outside of this file.
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*
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* @ignore
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* @since 6.6.1
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*
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* @param string $charset_slug Slug representing a text character encoding, or "charset".
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* E.g. "UTF-8", "Windows-1252", "ISO-8859-1", "SJIS".
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*
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* @return bool Whether the slug represents the UTF-8 encoding.
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*/
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function _is_utf8_charset( $charset_slug ) {
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if ( ! is_string( $charset_slug ) ) {
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return false;
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}
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return (
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0 === strcasecmp( 'UTF-8', $charset_slug ) ||
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0 === strcasecmp( 'UTF8', $charset_slug )
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);
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}
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if ( ! function_exists( 'mb_substr' ) ) :
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/**
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* Compat function to mimic mb_substr().
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*
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* @ignore
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* @since 3.2.0
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*
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* @see _mb_substr()
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*
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* @param string $string The string to extract the substring from.
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* @param int $start Position to being extraction from in `$string`.
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* @param int|null $length Optional. Maximum number of characters to extract from `$string`.
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* Default null.
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* @param string|null $encoding Optional. Character encoding to use. Default null.
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* @return string Extracted substring.
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*/
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function mb_substr( $string, $start, $length = null, $encoding = null ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound
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return _mb_substr( $string, $start, $length, $encoding );
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}
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endif;
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/**
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* Internal compat function to mimic mb_substr().
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*
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* Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
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* For `$encoding === UTF-8`, the `$str` input is expected to be a valid UTF-8 byte
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* sequence. The behavior of this function for invalid inputs is undefined.
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*
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* @ignore
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* @since 3.2.0
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*
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* @param string $str The string to extract the substring from.
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* @param int $start Position to being extraction from in `$str`.
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* @param int|null $length Optional. Maximum number of characters to extract from `$str`.
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* Default null.
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* @param string|null $encoding Optional. Character encoding to use. Default null.
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* @return string Extracted substring.
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*/
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function _mb_substr( $str, $start, $length = null, $encoding = null ) {
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if ( null === $str ) {
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return '';
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}
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if ( null === $encoding ) {
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$encoding = get_option( 'blog_charset' );
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}
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/*
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* The solution below works only for UTF-8, so in case of a different
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* charset just use built-in substr().
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*/
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if ( ! _is_utf8_charset( $encoding ) ) {
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return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length );
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}
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if ( _wp_can_use_pcre_u() ) {
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// Use the regex unicode support to separate the UTF-8 characters into an array.
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preg_match_all( '/./us', $str, $match );
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$chars = is_null( $length ) ? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
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return implode( '', $chars );
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}
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$regex = '/(
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[\x00-\x7F] # single-byte sequences 0xxxxxxx
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| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
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| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
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| [\xE1-\xEC][\x80-\xBF]{2}
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| \xED[\x80-\x9F][\x80-\xBF]
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| [\xEE-\xEF][\x80-\xBF]{2}
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| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
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| [\xF1-\xF3][\x80-\xBF]{3}
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| \xF4[\x80-\x8F][\x80-\xBF]{2}
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)/x';
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// Start with 1 element instead of 0 since the first thing we do is pop.
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$chars = array( '' );
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do {
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// We had some string left over from the last round, but we counted it in that last round.
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array_pop( $chars );
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/*
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* Split by UTF-8 character, limit to 1000 characters (last array element will contain
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* the rest of the string).
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*/
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$pieces = preg_split( $regex, $str, 1000, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
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$chars = array_merge( $chars, $pieces );
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// If there's anything left over, repeat the loop.
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} while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) );
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return implode( '', array_slice( $chars, $start, $length ) );
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}
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if ( ! function_exists( 'mb_strlen' ) ) :
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/**
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* Compat function to mimic mb_strlen().
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*
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* @ignore
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* @since 4.2.0
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*
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* @see _mb_strlen()
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*
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* @param string $string The string to retrieve the character length from.
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* @param string|null $encoding Optional. Character encoding to use. Default null.
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* @return int String length of `$string`.
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*/
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function mb_strlen( $string, $encoding = null ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound
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return _mb_strlen( $string, $encoding );
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}
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endif;
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/**
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* Internal compat function to mimic mb_strlen().
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*
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* Only supports UTF-8 and non-shifting single-byte encodings. For all other
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* encodings expect the counts to be wrong. When the given encoding (or the
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* `blog_charset` if none is provided) isn’t UTF-8 then the function returns
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* the byte-count of the provided string.
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*
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* @ignore
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* @since 4.2.0
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*
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* @param string $str The string to retrieve the character length from.
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* @param string|null $encoding Optional. Count characters according to this encoding.
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* Default is to consult `blog_charset`.
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* @return int Count of code points if UTF-8, byte length otherwise.
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*/
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function _mb_strlen( $str, $encoding = null ) {
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return _is_utf8_charset( $encoding ?? get_option( 'blog_charset' ) )
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? _wp_utf8_codepoint_count( $str )
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: strlen( $str );
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}
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if ( ! function_exists( 'utf8_encode' ) ) :
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if ( extension_loaded( 'mbstring' ) ) :
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/**
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* Converts a string from ISO-8859-1 to UTF-8.
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*
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* @deprecated Use {@see \mb_convert_encoding()} instead.
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*
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* @since 6.9.0
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*
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* @param string $iso_8859_1_text Text treated as ISO-8859-1 (latin1) bytes.
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* @return string Text converted into a UTF-8.
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*/
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function utf8_encode( $iso_8859_1_text ): string {
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_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
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return mb_convert_encoding( $iso_8859_1_text, 'UTF-8', 'ISO-8859-1' );
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}
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else :
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/**
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* @ignore
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* @private
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*
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* @since 6.9.0
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*/
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function utf8_encode( $iso_8859_1_text ): string {
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_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
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return _wp_utf8_encode_fallback( $iso_8859_1_text );
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}
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endif;
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endif;
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if ( ! function_exists( 'utf8_decode' ) ) :
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if ( extension_loaded( 'mbstring' ) ) :
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/**
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* Converts a string from UTF-8 to ISO-8859-1.
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*
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* @deprecated Use {@see \mb_convert_encoding()} instead.
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*
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* @since 6.9.0
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*
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* @param string $utf8_text Text treated as UTF-8.
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* @return string Text converted into ISO-8859-1.
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*/
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function utf8_decode( $utf8_text ): string {
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_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
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return mb_convert_encoding( $utf8_text, 'ISO-8859-1', 'UTF-8' );
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}
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else :
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/**
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* @ignore
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* @private
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*
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* @since 6.9.0
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*/
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function utf8_decode( $utf8_text ): string {
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_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
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return _wp_utf8_decode_fallback( $utf8_text );
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}
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endif;
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endif;
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// sodium_crypto_box() was introduced in PHP 7.2.
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if ( ! function_exists( 'sodium_crypto_box' ) ) {
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require ABSPATH . WPINC . '/sodium_compat/autoload.php';
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}
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if ( ! function_exists( 'is_countable' ) ) {
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/**
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* Polyfill for is_countable() function added in PHP 7.3.
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*
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* Verify that the content of a variable is an array or an object
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* implementing the Countable interface.
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*
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* @since 4.9.6
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*
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* @param mixed $value The value to check.
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* @return bool True if `$value` is countable, false otherwise.
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*/
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function is_countable( $value ) {
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return ( is_array( $value )
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|| $value instanceof Countable
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|| $value instanceof SimpleXMLElement
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|| $value instanceof ResourceBundle
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);
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}
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}
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if ( ! function_exists( 'array_key_first' ) ) {
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/**
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* Polyfill for array_key_first() function added in PHP 7.3.
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*
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* Get the first key of the given array without affecting
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* the internal array pointer.
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*
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* @since 5.9.0
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*
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* @param array $array An array.
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* @return string|int|null The first key of array if the array
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* is not empty; `null` otherwise.
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*/
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function array_key_first( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
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if ( empty( $array ) ) {
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return null;
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}
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foreach ( $array as $key => $value ) {
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return $key;
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}
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}
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}
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if ( ! function_exists( 'array_key_last' ) ) {
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/**
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* Polyfill for `array_key_last()` function added in PHP 7.3.
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*
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* Get the last key of the given array without affecting the
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* internal array pointer.
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*
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* @since 5.9.0
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*
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* @param array $array An array.
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* @return string|int|null The last key of array if the array
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*. is not empty; `null` otherwise.
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*/
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function array_key_last( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
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if ( empty( $array ) ) {
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return null;
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}
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end( $array );
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return key( $array );
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}
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}
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if ( ! function_exists( 'array_is_list' ) ) {
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/**
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* Polyfill for `array_is_list()` function added in PHP 8.1.
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*
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* Determines if the given array is a list.
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*
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* An array is considered a list if its keys consist of consecutive numbers from 0 to count($array)-1.
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*
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* @see https://github.com/symfony/polyfill-php81/tree/main
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*
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* @since 6.5.0
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*
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* @param array<mixed> $arr The array being evaluated.
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* @return bool True if array is a list, false otherwise.
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*/
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function array_is_list( $arr ) {
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if ( ( array() === $arr ) || ( array_values( $arr ) === $arr ) ) {
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return true;
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}
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$next_key = -1;
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foreach ( $arr as $k => $v ) {
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if ( ++$next_key !== $k ) {
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return false;
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}
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}
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return true;
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}
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}
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if ( ! function_exists( 'str_contains' ) ) {
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/**
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* Polyfill for `str_contains()` function added in PHP 8.0.
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*
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* Performs a case-sensitive check indicating if needle is
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* contained in haystack.
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*
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* @since 5.9.0
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*
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* @param string $haystack The string to search in.
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* @param string $needle The substring to search for in the `$haystack`.
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* @return bool True if `$needle` is in `$haystack`, otherwise false.
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*/
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function str_contains( $haystack, $needle ) {
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if ( '' === $needle ) {
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return true;
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}
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return false !== strpos( $haystack, $needle );
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}
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}
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if ( ! function_exists( 'str_starts_with' ) ) {
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/**
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* Polyfill for `str_starts_with()` function added in PHP 8.0.
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*
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* Performs a case-sensitive check indicating if
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* the haystack begins with needle.
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*
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* @since 5.9.0
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*
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* @param string $haystack The string to search in.
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* @param string $needle The substring to search for in the `$haystack`.
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* @return bool True if `$haystack` starts with `$needle`, otherwise false.
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*/
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function str_starts_with( $haystack, $needle ) {
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if ( '' === $needle ) {
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return true;
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}
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return 0 === strpos( $haystack, $needle );
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}
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}
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if ( ! function_exists( 'str_ends_with' ) ) {
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/**
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* Polyfill for `str_ends_with()` function added in PHP 8.0.
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*
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* Performs a case-sensitive check indicating if
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* the haystack ends with needle.
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*
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* @since 5.9.0
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*
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* @param string $haystack The string to search in.
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* @param string $needle The substring to search for in the `$haystack`.
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* @return bool True if `$haystack` ends with `$needle`, otherwise false.
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*/
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function str_ends_with( $haystack, $needle ) {
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if ( '' === $haystack ) {
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return '' === $needle;
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}
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$len = strlen( $needle );
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return substr( $haystack, -$len, $len ) === $needle;
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}
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}
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if ( ! function_exists( 'array_find' ) ) {
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/**
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* Polyfill for `array_find()` function added in PHP 8.4.
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*
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* Searches an array for the first element that passes a given callback.
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*
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* @since 6.8.0
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*
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||
* @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;
|
||
}
|
||
}
|
||
|
||
if ( ! function_exists( 'array_first' ) ) {
|
||
/**
|
||
* Polyfill for `array_first()` function added in PHP 8.5.
|
||
*
|
||
* Returns the first element of an array.
|
||
*
|
||
* @since 6.9.0
|
||
*
|
||
* @param array $array The array to get the first element from.
|
||
* @return mixed|null The first element of the array, or null if the array is empty.
|
||
*/
|
||
function array_first( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
|
||
if ( empty( $array ) ) {
|
||
return null;
|
||
}
|
||
|
||
foreach ( $array as $value ) {
|
||
return $value;
|
||
}
|
||
}
|
||
}
|
||
|
||
if ( ! function_exists( 'array_last' ) ) {
|
||
/**
|
||
* Polyfill for `array_last()` function added in PHP 8.5.
|
||
*
|
||
* Returns the last element of an array.
|
||
*
|
||
* @since 6.9.0
|
||
*
|
||
* @param array $array The array to get the last element from.
|
||
* @return mixed|null The last element of the array, or null if the array is empty.
|
||
*/
|
||
function array_last( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
|
||
if ( empty( $array ) ) {
|
||
return null;
|
||
}
|
||
|
||
return $array[ array_key_last( $array ) ];
|
||
}
|
||
}
|
||
|
||
// 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 );
|
||
}
|