php获取外网真实IP的二种方法

2. function get_onlineip() {
3. $ch = curl_init('http://www.ip138.com/ip2city.asp');
4. curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
5. $a = curl_exec($ch);
6. preg_match('/\[(.*)\]/', $a, $ip);
7. return $ip[1];
8. }
9. ?>

方法2：使用$_SERVER['HTTP_X_FORWARDED_FOR']

2. function get_onlineip() {
3. $onlineip = '';
4. if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
5. $onlineip = getenv('HTTP_CLIENT_IP');
6. } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
7. $onlineip = getenv('HTTP_X_FORWARDED_FOR');
8. } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
9. $onlineip = getenv('REMOTE_ADDR');
10. } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
11. $onlineip = $_SERVER['REMOTE_ADDR'];
12. }
13. return $onlineip;
14. }
15. ?>