PHP防止外部提交表单

[PHP]代码

1. $referer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : NULL;
2. $host = $_SERVER['HTTP_HOST'];
3. echo '提交过来的地址：'.$referer;
4. echo '
   ';
5. echo '本站域名：'.$host;
6. echo '
   ';
7. echo substr($referer,7,strlen($host));
8. if(substr($referer,7,strlen($host)) != $host){
9. echo '非法操作';
10. }else{
11. echo '正常操作';
12. }