根据IP定位用户所在城市信息

http://www.9958.pw/post/city_ip

1.调用新浪IP地址库

新浪提供了开放的IP地址库数据供开发者调用，调用地址：

http://int.dpool.sina.com.cn/iplookup/iplookup.php，即可返回当前ip所在的省市信息。

<script type="text/javascript" src="js/jquery.js"></script> <script type="text/javascript" src="js/jquery.cityselect.js"></script> <script type="text/javascript" src="http://int.dpool.sina.com.cn/iplookup/iplookup.php? format=js"></script>

我们先载入jquery库和cityselect城市下拉插件，然后调用新浪的IP地址库，并以js的形式返回，当然如果你想查询某一指定IP所在的城市信息可以使用接口地址如：http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=123.123.123.123，将参数ip值换成指定的IP地址即可。

本地js调用：

var myprovince = remote_ip_info['province']; var mycity = remote_ip_info['city'] var mydistrict = remote_ip_info['district']; $(function(){
                                $("#city_1").citySelect({
                                      prov:myprovince, city:mycity }); });

HTML代码为：

<h3>调用新浪IP库接口</h3> <p>您所在的城市是：<script>document.write(myprovince+' '+mycity);</script></p> <div id="city_1"> <select class="prov"></select> <select class="city"></select> </div>

2.调用淘宝IP地址库

淘宝也提供了比较权威的IP地址库，调用地址：http://ip.taobao.com/service/getIpInfo.php?ip=123.123.123.123，返回对应IP的省市相关信息。

调用方法：

$(function(){
         $.getJSON("getTaoIP.php",function(json){
                   var myprovince2 = json.data.region; var mycity2 = json.data.city; $("#city_2").html("您所在的城市是："+myprovince2+mycity2); }); });

getTaoIP.php用来获取淘宝的对应IP的省市信息，返回的是json格式的数据。

$ip = get_client_ip(); //获取当前用户的ip  $url = "http://ip.taobao.com/service/getIpInfo.php?ip=".$ip; $data = file_get_contents($url); //调用淘宝接口获取信息  echo $data;

get_client_ip()用来获取本地用户的IP地址。

//获取用户真实IP  function get_client_ip() {
            if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) $ip = getenv("HTTP_CLIENT_IP"); else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) $ip = getenv("HTTP_X_FORWARDED_FOR"); else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) $ip = getenv("REMOTE_ADDR"); else if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) $ip = $_SERVER['REMOTE_ADDR']; else $ip = "unknown"; return ($ip); }

案例代码分享

数据表

DROP TABLE IF EXISTS `think_ipdb`; CREATE TABLE `think_ipdb` ( `id` int(11) NOT NULL AUTO_INCREMENT, `ip` varchar(30) DEFAULT NULL, `country` varchar(50) DEFAULT NULL, `province` varchar(30) DEFAULT NULL, `city` varchar(30) DEFAULT NULL, `district` varchar(30) DEFAULT NULL, `isp` varchar(50) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `ip` (`ip`) USING BTREE ) ENGINE=MyISAM AUTO_INCREMENT=24780 DEFAULT CHARSET=utf8 COMMENT='本地 IP地址库';

调用实例

$think_ipdb = M('think_ipdb',null,C('UC_DB_DSN')); // 实例化User对象 $city = $this->_getLocalDbIp($think_ipdb,$value['ip']);

类方法

/** * 获取本地ip库信息 * @param type $db * @param type $ip */ private function _getLocalDbIp($db,$ip) {
                  if(empty($ip)){
                         return null; } $tmp = $db->where(array('ip'=>$ip))->find(); if(empty($tmp)){
                                                     $address = getAddressFromIp($ip); if(!empty($address)){
                                                                  $address['ip'] = $ip; $db->add($address); return $address['city']; }else{
                                                                                          return null; } }else{
                                                                                                     $city = $tmp['city']; } }

通用函数

//根据ip地址获取地址信息 function getAddressFromIp($ip){
            $urlTaobao = 'http://ip.taobao.com/service/getIpInfo.php?ip='.$ip; $urlSina = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip='.$ip; $json = file_get_contents($urlTaobao); $jsonDecode = json_decode($json); if($jsonDecode->code==0){
                                              //如果取不到就去取新浪的 $data['country'] = $jsonDecode->data->country; $data['province'] = $jsonDecode->data->region; $data['city'] = $jsonDecode->data->city; $data['isp'] = $jsonDecode->data->isp; return $data; }else{
                                                                                                        $json = file_get_contents($urlSina); $jsonDecode = json_decode($json); $data['country'] = $jsonDecode->country; $data['province'] = $jsonDecode->province; $data['city'] = $jsonDecode->city; $data['isp'] = $jsonDecode->isp; $data['district'] = $jsonDecode->district; return $data; } } //根据ip地质获取城市名 function getCityFromIp($ip){
                                                                                                                                                                                      $data = getAddressFromIp($ip); return $data['city']; }