一个PHP里用户注册的问题

?php if($_GET[aaa]){ setcookie("cookie", "outasdfa"); echo "script language=\"javascript\" alert ('out');/script"; echo "script language=\"javascript\"location.href='login.php';/script"; } if($_POST[id]=='admin'){ $pw=md5($_POST[pw]); //密

if($_GET[aaa]){
setcookie("cookie", "outasdfa");
echo "