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($ch);     preg_match("@<span>(.*)</span></p>@iU",$result,$ipArray);     $loc = $ipArray[1];     echo $loc;