3 * @version $Id: strspn.php,v 1.1 2006/02/25 13:50:17 harryf Exp $
8 //---------------------------------------------------------------
10 * UTF-8 aware alternative to strspn
11 * Find length of initial segment matching mask
12 * Note: requires utf8_strlen and utf8_substr (if start, length are used)
15 * @see http://www.php.net/strspn
19 function utf8_strspn($str, $mask, $start = NULL, $length = NULL) {
21 $mask = preg_replace('!([\\\\\\-\\]\\[/^])!','\\\${1}',$mask);
23 if ( $start !== NULL || $length !== NULL ) {
24 $str = utf8_substr($str, $start, $length);
27 preg_match('/^['.$mask.']+/u',$str, $matches);
29 if ( isset($matches[0]) ) {
30 return utf8_strlen($matches[0]);