clean_title.php

    function clean_title($s, $max_chars=64) {
        $result = '';
        $arr = str_split($s);
        $allowed_chars = str_split('0123456789"(),.:;- йцукенгшщзхъфывапролджэёячсмитьбюqwertyuiopasdfghjklzxcvbnm');
        foreach ($arr as $char) {
            if (len($result) >= $max_chars) {
                break;
            }
            if (in_array(strtolower($char), $allowed_chars)) {
                $result += $char;
            }
        }
        return $result;
    }

function cleanTitle($s, $maxChars = 64) {
	$regex = '#[^"()\x20,.:;-а-яa-z0-9]#';
	return substr(preg_replace($regex, '', mb_strtolower($s)), 0, $maxChars);
}