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Add mb_substr() back to compat.php (it is non-default). see #16918. props joostdevalk

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git-svn-id: https://develop.svn.wordpress.org/trunk@17621 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Mark Jaquith 2011-04-07 15:46:57 +00:00
parent f5078e5c93
commit cce6b87946
1 changed files with 19 additions and 0 deletions
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19
wp-includes/compat.php
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@ -12,3 +12,22 @@ if ( !function_exists('_') ) {
return $string; return $string;
} }
} }
if ( !function_exists('mb_substr') ):
function mb_substr( $str, $start, $length=null, $encoding=null ) {
return _mb_substr($str, $start, $length, $encoding);
}
endif;
function _mb_substr( $str, $start, $length=null, $encoding=null ) {
// the solution below, works only for utf-8, so in case of a different
// charset, just use built-in substr
$charset = get_option( 'blog_charset' );
if ( !in_array( $charset, array('utf8', 'utf-8', 'UTF8', 'UTF-8') ) ) {
return is_null( $length )? substr( $str, $start ) : substr( $str, $start, $length);
}
// 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 );
}