php判断访问IP

判断访问IP

php代码

1. function getIP() {
2. if (! empty ( $_SERVER ["HTTP_CLIENT_IP"] )) {
3. $cip = $_SERVER ["HTTP_CLIENT_IP"];
4. } else if (! empty ( $_SERVER ["HTTP_X_FORWARDED_FOR"] )) {
5. $cip = $_SERVER ["HTTP_X_FORWARDED_FOR"];
6. } else if (! empty ( $_SERVER ["REMOTE_ADDR"] )) {
7. $cip = $_SERVER ["REMOTE_ADDR"];
8. } else {
9. $cip = '';
10. }
11. preg_match ( "/[\d\.]{7,15}/", $cip, $cips );
12. $cip = isset ( $cips [0] ) ? $cips [0] : 'unknown';
13. unset ( $cips );
14. return $cip;
15. }
17. ?>