php 来路判断 HTTP_REFERER

1. $ref = isset($_server['http_referer'])?$_server['http_referer']:''; 
2. echo $ref; 
3. if(strpos($ref,'192.168.0.119')!==false) 
4. { 
5.  echo '来路正确！'; 
6. } 
7. else 
8. { 
9.  echo '错误来路'; 
10. } 
11. ?> 
12. <a href="http://www.phpfensi.com/plus/download.php?open=0&aid=20861&cid=3">判断来路</a>