php获取在线访客Ip地址信息的方法

3. if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {

4. $onlineip = getenv('HTTP_CLIENT_IP');
5. } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
6. $onlineip = getenv('HTTP_X_FORWARDED_FOR');
7. } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
8. $onlineip = getenv('REMOTE_ADDR');
9. } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
10. $onlineip = $_SERVER['REMOTE_ADDR'];
11. }

12. preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);

13. $onlineip = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown';
14. unset($onlineipmatches);
15. ?>

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