URL传参加密解密后怎么获取数据

$str = 'qq=xxx&ww=qqqqq&m=15010101817&rf=qwqw&ip=192.168.1.1 ';
$arr = explode('&', $str);

foreach($arr as $k=>$v){
	$res[$k] = explode('=', $v);
	$ret[] = $res[$k][1];
}

print_r($ret);

$s = 'qq=xxx&ww=qqqqq&m=15010101817&rf=qwqw&ip=192.168.1.1';
parse_str($s, $a);
print_r($a);

Array
(
    [qq] => xxx
    [ww] => qqqqq
    [m] => 15010101817
    [rf] => qwqw
    [ip] => 192.168.1.1
)