function array_prepend($array, $string, $deep=false) {
    if(empty($array)||empty($string)) return $array;
    foreach($array as $key => $element)
        if(is_array($element))
            if($deep)
                $array[$key] = array_prepend($element,$string,$deep);
            else
                trigger_error('array_prepend: array element',E_USER_WARNING);
        else
            $array[$key] = $string.$element;
    return $array;
   
}