php根据IP地址获取地理位置

    <?php    header("content-type: text/html; charset=utf-8");     //获取ip地址的方法    function getip(){        if (isset($_server)) {            if (isset($_server['http_x_forwarded_for'])) {                $realip = $_server['http_x_forwarded_for'];            } elseif (isset($_server['http_client_ip'])) {                $realip = $_server['http_client_ip'];            } else {                $realip = $_server['remote_addr'];            }        } else {            if (getenv("http_x_forwarded_for")) {                $realip = getenv( "http_x_forwarded_for");            } elseif (getenv("http_client_ip")) {                $realip = getenv("http_client_ip");            } else {                $realip = getenv("remote_addr");            }        }        return $realip;    }        echo $ip = getip();//通过php的file_get_contents()方法获取地理位置//新浪接口根据ip查询所在区域信息$res0 = file_get_contents("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=$ip");$res0 = json_decode($res0,true);print_r($res0);echo "<br/>";//淘宝接口根据ip查询所在区域信息$res1 = file_get_contents("http://ip.taobao.com/service/getipinfo.php?ip=$ip");$res1 = json_decode($res1,true);print_r($res1);echo "<br/>";//通过php的curl获取地理位置//新浪根据ip获取地理位置api    $url = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=$ip';     $ch = curl_init($url);     curl_setopt($ch,curlopt_encoding ,'utf8');     curl_setopt($ch, curlopt_timeout, 10);     curl_setopt($ch, curlopt_returntransfer, true) ; // 获取数据返回     $location = curl_exec($ch);     $location = json_decode($location);     print_r($location);    curl_close($ch);          $loc = "";     if($location===false) return "";     if (empty($location->desc)) {         $loc = $location->province.$location->city.$location->district.$location->isp;     }else{         $loc = $location->desc;     }     echo  $loc; //腾讯根据ip获取地理位置api    $url = 'http://ip.qq.com/cgi-bin/searchip?searchip1=$ip';     $ch = curl_init($url);     curl_setopt($ch,curlopt_encoding ,'gb2312');     curl_setopt($ch, curlopt_timeout, 10);     curl_setopt($ch, curlopt_returntransfer, true) ; // 获取数据返回     $result = curl_exec($ch);     $result = mb_convert_encoding($result, "utf-8", "gb2312"); // 编码转换，否则乱码     curl_close($ch);     preg_match("@<span>(.*)</span></p>
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                @iU",$result,$ipArray);     $loc = $ipArray[1];     echo $loc;