关于url碥码,该如何解决

关于url碥码

$str="%C3%F7%D0%C7%CD%AC%BF%EE%D7%B0%B1%B8";
$str=urldecode($str); 

$str="%C3%F7%D0%C7%CD%AC%BF%EE%D7%B0%B1%B8";
$str=urldecode($str); 
$str=iconv("GBK", "UTF-8", $str); 
echo $str;