function sort(&$ary, $compareField, $seq='DESC', $sortFlag=SORT_NUMERIC) {
        $sortData = array();
        foreach($ary as $key => $value) {
            $sortData[$key] = $value[$compareField];
        }
        ($seq == 'DESC') ? arsort($sortData, $sortFlag) : asort($sortData, $sortFlag);

        $ret = array();
        foreach($sortData as $key => $value) {
            $ret[$key] = $ary[$key];
        }
        $ary = &$ret;
        return $ary;
}