php查询IP地址归属等信息

淘宝公司提供了一个很好用的IP地理信息查询接口。
在这里:http://ip.taobao.com/
TaobaoIPQuery2这个类将极大的简化相关的信息查询。

类 TaobaoIPQuery2 文件：

 <?php
 /* Usage:
  * $IPInfo = TaobaoIPQuery2::getIPInfo('IPAddress');

 http://www.cnblogs.com/roucheng/
  */
 Class TaobaoIPQuery2{
     private static $_requestURL = 'http://ip.taobao.com/service/getIpInfo.php';
     public static function getIPInfo($ip){
         $long = ip2long($ip);
         if($long === 0){
             throw new Exception('IP address error', 5);
         }
         $ip=long2ip($long);
         $IPInfo = self::queryIPInfo($ip);
         return self::parseJSON($IPInfo);
     }

     private static function queryIPInfo($ip){
         $query = http_build_query(array('ip'=>$ip));
         $ch = curl_init();
         $options = array(
             CURLOPT_URL => sprintf('%s?%s', self::$_requestURL, $query),
             CURLOPT_RETURNTRANSFER => true,
             CURLOPT_AUTOREFERER => false,
             CURLOPT_FOLLOWLOCATION => false,
             CURLOPT_HEADER => false,
             CURLOPT_TIMEOUT => 3.0,
         );
         curl_setopt_array($ch, $options);
         $content = curl_exec($ch);
         curl_close($ch);
         return $content;
     }

     private static function parseJSON($json){
         $O = json_decode ($json, true);
         if(false === is_null($O)){
             return $O;
         }
         if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
             $errorCode = json_last_error();
             if(isset(self::$_JSONParseError[$errorCode])){
                 throw new Exception(self::$_JSONParseError[$errorCode], 5);
             }
         }
         throw new Exception('JSON parse error', 5);
     }

     private static $_JSONParseError = array(
         JSON_ERROR_NONE=>'No error has occurred',
         JSON_ERROR_DEPTH=>'The maximum stack depth has been exceeded',
         JSON_ERROR_CTRL_CHAR=>'Control character error, possibly incorrectly encoded',
         JSON_ERROR_STATE_MISMATCH=>'Invalid or malformed JSON',
         JSON_ERROR_SYNTAX=>'Syntax error',
         JSON_ERROR_UTF8=>'Malformed UTF-8 characters, possibly incorrectly encoded',
     );
 }

TaobaoIPQuery2.Class.php：

 <?php
 Class TaobaoIPQuery2{
     private static $_requestURL = 'http://ip.taobao.com/service/getIpInfo.php';
     public static function getIPInfo($ip){
         $long = ip2long($ip);
         if($long === 0){
             throw new Exception('IP address error', 5);
         }
         $ip=long2ip($long);
         $IPInfo = self::queryIPInfo($ip);
         return self::parseJSON($IPInfo);
     }

     private static function queryIPInfo($ip){
         $query = http_build_query(array('ip'=>$ip));
         $ch = curl_init();
         $options = array(
             CURLOPT_URL => sprintf('%s?%s', self::$_requestURL, $query),
             CURLOPT_RETURNTRANSFER => true,
             CURLOPT_AUTOREFERER => false,
             CURLOPT_FOLLOWLOCATION => false,
             CURLOPT_HEADER => false,
             CURLOPT_TIMEOUT => 3.0,
         );
         curl_setopt_array($ch, $options);
         $content = curl_exec($ch);
         curl_close($ch);
         return $content;
     }

     private static function parseJSON($json){
         $O = json_decode ($json, true);
         if(false === is_null($O)){
             return $O;
         }
         if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
             $errorCode = json_last_error();
             if(isset(self::$_JSONParseError[$errorCode])){
                 throw new Exception(self::$_JSONParseError[$errorCode], 5);
             }
         }
         throw new Exception('JSON parse error', 5);
     }
     /* http://www.cnblogs.com/roucheng/ */
     private static $_JSONParseError = array(
         JSON_ERROR_NONE=>'No error has occurred',
         JSON_ERROR_DEPTH=>'The maximum stack depth has been exceeded',
         JSON_ERROR_CTRL_CHAR=>'Control character error, possibly incorrectly encoded',
         JSON_ERROR_STATE_MISMATCH=>'Invalid or malformed JSON',
         JSON_ERROR_SYNTAX=>'Syntax error',
         JSON_ERROR_UTF8=>'Malformed UTF-8 characters, possibly incorrectly encoded',
     );
 }

调用：

$ip = $_SERVER["REMOTE_ADDR"];
$ipquery = new taobaoIPQuery($ip);
$region = $ipquery->get_region();
$country = $ipquery->get_country();
$city = $ipquery->get_city();

另外新浪也提供接口：http://ipapi.sinaapp.com/