PHP 根据IP地址获取所在城市

1. <?php  

2. header('Content-Type:text/html;Charset=utf-8');  

3. function GetIp(){  

4.     $realip = '';  

5.     $unknown = 'unknown';  

6.     if (isset($_SERVER)){  

7.         if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_FOR'], $unknown)){  

8.             $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);  

9.             foreach($arr as $ip){  

10.                 $ip = trim($ip);  

11.                 if ($ip != 'unknown'){  

12.                     $realip = $ip;  

13.                     break;  

14.                 }  

15.             }  

16.         }else if(isset($_SERVER['HTTP_CLIENT_IP']) && !empty($_SERVER['HTTP_CLIENT_IP']) && strcasecmp($_SERVER['HTTP_CLIENT_IP'], $unknown)){  

17.             $realip = $_SERVER['HTTP_CLIENT_IP'];  

18.         }else if(isset($_SERVER['REMOTE_ADDR']) && !empty($_SERVER['REMOTE_ADDR']) && strcasecmp($_SERVER['REMOTE_ADDR'], $unknown)){  

19.             $realip = $_SERVER['REMOTE_ADDR'];  

20.         }else{  

21.             $realip = $unknown;  

22.         }  

23.     }else{  

24.         if(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), $unknown)){  

25.             $realip = getenv("HTTP_X_FORWARDED_FOR");  

26.         }else if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), $unknown)){  

27.             $realip = getenv("HTTP_CLIENT_IP");  

28.         }else if(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), $unknown)){  

29.             $realip = getenv("REMOTE_ADDR");  

30.         }else{  

31.             $realip = $unknown;  

32.         }  

33.     }  

34.     $realip = preg_match("/[\d\.]{7,15}/", $realip, $matches) ? $matches[0] : $unknown;  

35.     return $realip;  

36. }  

37.   

38. function GetIpLookup($ip = ''){  

39.     if(empty($ip)){  

40.         $ip = GetIp();  

41.     }  

42.     $res = @file_get_contents('http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=' . $ip);  

43.     if(empty($res)){ return false; }  

44.     $jsonMatches = array();  

45.     preg_match('#\{.+?\}#', $res, $jsonMatches);  

46.     if(!isset($jsonMatches[0])){ return false; }  

47.     $json = json_decode($jsonMatches[0], true);  

48.     if(isset($json['ret']) && $json['ret'] == 1){  

49.         $json['ip'] = $ip;  

50.         unset($json['ret']);  

51.     }else{  

52.         return false;  

53.     }  

54.     return $json;  

55. }  

56.   

57.   

58. $ipInfos = GetIpLookup('123.125.114.144'); //baidu.com IP地址  

59. var_dump($ipInfos);  

使用了新浪的开放API，执行速度还是非常赞的。

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