PHP 根据IP地址判断所在城市等信息

获得IP地址

在 PHP 中得到当前访问者的IP地址，还是比较简单的:

$ip = $_SERVER[\'REMOTE_ADDR\']

上面IP有时获取不到真实IP地址我们可以如下操作

function GetIP() {
    if ($_SERVER[\"HTTP_X_FORWARDED_FOR\"]) $ip = $_SERVER[\"HTTP_X_FORWARDED_FOR\"];
    else if ($_SERVER[\"HTTP_CLIENT_IP\"]) $ip = $_SERVER[\"HTTP_CLIENT_IP\"];
    else if ($_SERVER[\"REMOTE_ADDR\"]) $ip = $_SERVER[\"REMOTE_ADDR\"];
    else if (getenv(\"HTTP_X_FORWARDED_FOR\")) $ip = getenv(\"HTTP_X_FORWARDED_FOR\");
    else if (getenv(\"HTTP_CLIENT_IP\")) $ip = getenv(\"HTTP_CLIENT_IP\");
    else if (getenv(\"REMOTE_ADDR\")) $ip = getenv(\"REMOTE_ADDR\");
    else $ip = \"Unknown\";
    return $ip;
}
echo GetIP();

将IP转换为城市等信息

淘宝提供了一个IP数据接口: http://ip.taobao.com/service/getIpInfo.php?ip=ip地址

$response = file_get_contents(\'http://ip.taobao.com/service/getIpInfo.php?ip=\'.$ip);
$result   = json_decode($response);
print_r($result);

输出结果为:

stdClass  
(
    [code] => 0
    [data] => stdClass  
        (
            [country] => 中国
            [country_id] => CN
            [area] => 华南
            [area_id] => 800000
            [region] => 广东省
            [region_id] => 440000
            [city] => 深圳市
            [city_id] => 440300
            [county] => 
            [county_id] => -1
            [isp] => 电信
            [isp_id] => 100017
            [ip] => 183.16.191.102
        )
)