PHP获取访问者IP

方法一：$_SERVER['HTTP_X_FORWARDED_FOR']来获取相应的地址

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1. function get_onlineip() {  
2. $onlineip = '';  
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. return $onlineip;  
13. }

http://www.ip138.com/ip2city.asp

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