How does php determine domain name jump?

#How does php determine domain name jump?

php method to determine domain name jump:

<?php 
switch ($_SERVER["HTTP_HOST"]) 
{ 
case "要判断的域名": 
header("location:跳转路径"); 
break; 
case "要判断的域名": 
header("location:跳转路径"); 
break; 
?>

Copy the above file to a blank php file , save and upload to the root directory of the website. That’s it.

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