Just a little function which mimics the original mysql_real_escape_string but which doesn't need an active mysql connection. Could be implemented as a static function in a database class. Hope it helps someone.

<?php
function mysql_escape_mimic($inp) {
    if(is_array($inp))
        return array_map(__METHOD__, $inp);

    if(!empty($inp) && is_string($inp)) {
        return str_replace(array('\\', "\0", "\n", "\r", "'", '"', "\x1a"), array('\\\\', '\\0', '\\n', '\\r', "\\'", '\\"', '\\Z'), $inp);
    }

    return $inp;
}
?>