PHP Two-dimensional arrays are sorted according to an element (key)

    /** * Two-dimensional array sorted by key * @param $arr * @param $arr _key * @param string $order collation * @return Mixed 
    */    functionMyarraymultisort ($arr,$arr _key,$order= ' ASC '){        foreach($arr  as $val){            $key _arrays[]=$val[$arr _key]; }        if($order= = ' ASC '){            Array_multisort($key _arrays, Sort_asc,sort_numeric,$arr); }Else{            Array_multisort($key _arrays, Sort_desc,sort_numeric,$arr); }        return $arr; }

PHP Two-dimensional arrays are sorted according to an element (key)