243,250c243
<     if (empty($key)) {
<       return false;
<     }
<     for ($i = 0; $i < strlen($key); ++ $i) {
<       $c = substr($key, $i, 1);
<       if (($c >= 'a' && $c <= 'z') || ($c >= 'A' && $c <= 'Z') || ($c >= '0' && $c <= '9') || ($c == '-') || ($c == '_') || ($c == '.')) {
<         continue;
<       }
---
>     if (empty($key) || preg_match('/[^\w\-\.\_]/gi', $key)) {