php根据IP地址获取地理位置

//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;