php判断id参数跳转代码

<?php
function go_url($url) {
 header('HTTP/1.1 301 Moved Permanently');
 exit(header('location:'.$url));
}
//通过get函数获取id
$id = $_GET['id'];
if($id == art){
 $url = "https://www.1004619.com/";
}else if($id == Crafts){
 $url = "https://www.1004619.com/";
}else if($id == automotive){
 $url = "https://www.1004619.com/";
}else{
 $url = "http://www.www.com";
}
go_url($url);
?>

新增方法，改下id

}else if($id == 3){
 $url = "http://www.www.com";