strspn.php

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<?php
/**
* @version $Id$
* @package utf8
* @subpackage strings
*/

//---------------------------------------------------------------
/**
* UTF-8 aware alternative to strspn
* Find length of initial segment matching mask
* Note: requires utf8_strlen and utf8_substr (if start, length are used)
* @param string
* @return int
* @see http://www.php.net/strspn
* @package utf8
* @subpackage strings
*/
function utf8_strspn($str, $mask, $start = NULL, $length = NULL) {

    $mask = preg_replace('!([\\\\\\-\\]\\[/^])!','\\\${1}',$mask);

        // Fix for $start but no $length argument.
    if ($start !== null && $length === null) {
        $length = utf8_strlen($str);
    }

    if ( $start !== NULL || $length !== NULL ) {
        $str = utf8_substr($str, $start, $length);
    }

    preg_match('/^['.$mask.']+/u',$str, $matches);

    if ( isset($matches[0]) ) {
        return utf8_strlen($matches[0]);
    }

    return 0;

}