HTTP anti-theft chain some simple settings

Create 1.html in local folder and another folder, respectively

<a href= "" > Connect to A.php</a>

Connect to a.php separately

<?php

//HTTP_REFERER   引导用户代理到当前页的前一页的地址（如果存在）。由 user agent 设置决定。并不是所有的用户代理都会设置该项，有的还提供了修改 　　　　　　HTTP_REFERER 的功能。简言之，该值并不可信。 

if ($_server["Http_referer"]) {
# code ...

Strpos Find where the string first appears
if (Strpos ($_server["Http_referer"], "http://localhost/PHP") = = 0) {
# code ...
echo "You can access";
}else{
echo "You cannot access";
}
}else{
echo "You son wants to hotlinking ah";
}
?>

HTTP anti-theft chain some simple settings