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git-svn-id: http://svn.automattic.com/wordpress/trunk@17621 1a063a9b-81f0-0310-95a4-ce76da25c4cd
34 lines
1.1 KiB
PHP
34 lines
1.1 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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if ( !function_exists('mb_substr') ):
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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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function _mb_substr( $str, $start, $length=null, $encoding=null ) {
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// the solution below, works only for utf-8, so in case of a different
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// charset, just use built-in substr
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$charset = get_option( 'blog_charset' );
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if ( !in_array( $charset, 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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// 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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