http_referer 获取用户来路实例,这是个php自来全局变量,所以我们不多介绍了,直接看实例:

1. <?php 
2.             if (isset($_server['http_referer'])) { 
3.                     print "the page you were on previously was {$_server['http_referer']}<br />"; 
4.             } else { 
5.                     print "you didn't click any links to get here<br />"; 
6.             } 
7. ?> 
8.  
9. <a href="refer.php">click me!</a> 
10.  

出处：http://www.phpfensi.com/php/20140523/3046.html