377 lines
12 KiB
PHP
377 lines
12 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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* @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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function _( $string ) {
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return $string;
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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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* @staticvar string $utf8_pcre
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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' === $utf8_pcre ) {
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// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- intentional error generated to detect PCRE/u support.
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$utf8_pcre = @preg_match( '/^./u', 'a' );
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}
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return $utf8_pcre;
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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 $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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return _mb_substr( $str, $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 sequence.
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* 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 === $encoding ) {
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$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 ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
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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 join( '', 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 $str The string to retrieve the character length from.
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* @param string|null $encoding Optional. Character encoding to use. Default null.
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* @return int String length of `$str`.
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*/
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function mb_strlen( $str, $encoding = null ) {
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return _mb_strlen( $str, $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 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 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 $encoding Optional. Character encoding to use. Default null.
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* @return int String length of `$str`.
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*/
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function _mb_strlen( $str, $encoding = null ) {
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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 charset
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* just use built-in strlen().
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*/
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if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
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return strlen( $str );
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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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return count( $match[0] );
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}
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$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 at 1 instead of 0 since the first thing we do is decrement.
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$count = 1;
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do {
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// We had some string left over from the last round, but we counted it in that last round.
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$count--;
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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, $str, 1000 );
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// Increment.
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$count += count( $pieces );
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// If there's anything left over, repeat the loop.
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} while ( $str = array_pop( $pieces ) );
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// Fencepost: preg_split() always returns one extra item in the array.
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return --$count;
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}
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if ( ! function_exists( 'hash_hmac' ) ) :
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/**
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* Compat function to mimic hash_hmac().
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*
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* The Hash extension is bundled with PHP by default since PHP 5.1.2.
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* However, the extension may be explicitly disabled on select servers.
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* As of PHP 7.4.0, the Hash extension is a core PHP extension and can no
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* longer be disabled.
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* I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill
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* and the associated `_hash_hmac()` function can be safely removed.
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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 _hash_hmac()
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*
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* @param string $algo Hash algorithm. Accepts 'md5' or 'sha1'.
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* @param string $data Data to be hashed.
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* @param string $key Secret key to use for generating the hash.
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* @param bool $raw_output Optional. Whether to output raw binary data (true),
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* or lowercase hexits (false). Default false.
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* @return string|false The hash in output determined by `$raw_output`. False if `$algo`
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* is unknown or invalid.
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*/
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function hash_hmac( $algo, $data, $key, $raw_output = false ) {
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return _hash_hmac( $algo, $data, $key, $raw_output );
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}
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endif;
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/**
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* Internal compat function to mimic hash_hmac().
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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 $algo Hash algorithm. Accepts 'md5' or 'sha1'.
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* @param string $data Data to be hashed.
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* @param string $key Secret key to use for generating the hash.
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* @param bool $raw_output Optional. Whether to output raw binary data (true),
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* or lowercase hexits (false). Default false.
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* @return string|false The hash in output determined by `$raw_output`. False if `$algo`
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* is unknown or invalid.
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*/
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function _hash_hmac( $algo, $data, $key, $raw_output = false ) {
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$packs = array(
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'md5' => 'H32',
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'sha1' => 'H40',
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);
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if ( ! isset( $packs[ $algo ] ) ) {
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return false;
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}
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$pack = $packs[ $algo ];
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if ( strlen( $key ) > 64 ) {
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$key = pack( $pack, $algo( $key ) );
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}
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$key = str_pad( $key, 64, chr( 0 ) );
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$ipad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x36 ), 64 ) );
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$opad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x5C ), 64 ) );
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$hmac = $algo( $opad . pack( $pack, $algo( $ipad . $data ) ) );
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if ( $raw_output ) {
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return pack( $pack, $hmac );
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}
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return $hmac;
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}
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if ( ! function_exists( 'hash_equals' ) ) :
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/**
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* Timing attack safe string comparison
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*
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* Compares two strings using the same time whether they're equal or not.
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*
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* Note: It can leak the length of a string when arguments of differing length are supplied.
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*
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* This function was added in PHP 5.6.
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* However, the Hash extension may be explicitly disabled on select servers.
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* As of PHP 7.4.0, the Hash extension is a core PHP extension and can no
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* longer be disabled.
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* I.e. when PHP 7.4.0 becomes the minimum requirement, this polyfill
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* can be safely removed.
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*
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* @since 3.9.2
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*
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* @param string $a Expected string.
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* @param string $b Actual, user supplied, string.
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* @return bool Whether strings are equal.
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*/
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function hash_equals( $a, $b ) {
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$a_length = strlen( $a );
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if ( $a_length !== strlen( $b ) ) {
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return false;
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}
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$result = 0;
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// Do not attempt to "optimize" this.
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for ( $i = 0; $i < $a_length; $i++ ) {
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$result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
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}
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return $result === 0;
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}
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endif;
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// random_int() was introduced in PHP 7.0.
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if ( ! function_exists( 'random_int' ) ) {
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require ABSPATH . WPINC . '/random_compat/random.php';
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}
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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 $var The value to check.
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*
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* @return bool True if `$var` is countable, false otherwise.
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*/
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function is_countable( $var ) {
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return ( is_array( $var )
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|| $var instanceof Countable
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|| $var instanceof SimpleXMLElement
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|| $var instanceof ResourceBundle
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);
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}
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}
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if ( ! function_exists( 'is_iterable' ) ) {
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/**
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* Polyfill for is_iterable() function added in PHP 7.1.
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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 Traversable interface.
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*
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* @since 4.9.6
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*
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* @param mixed $var The value to check.
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*
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* @return bool True if `$var` is iterable, false otherwise.
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*/
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function is_iterable( $var ) {
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return ( is_array( $var ) || $var instanceof Traversable );
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}
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}
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