PHP获取用户IP地址的最准确方法

这是获取IP地址的更简洁，更简洁的方法：

function get_ip_address(){

foreach (array('HTTP_CLIENT_IP','HTTP_X_FORWARDED_FOR','HTTP_X_FORWARDED','HTTP_X_CLUSTER_CLIENT_IP','HTTP_FORWARDED_FOR','HTTP_FORWARDED','REMOTE_ADDR') as $key){

if (array_key_exists($key,$_SERVER) === true){

foreach (explode(',',$_SERVER[$key]) as $ip){

$ip = trim($ip); // just to be safe

if (filter_var($ip,FILTER_VALIDATE_IP,FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) !== false){

return $ip;

}

}

}

}

}

我希望它有所帮助！

您的代码似乎已经相当完整，我看不到任何可能的错误（除了通常的IP警告），我会更改validate_ip()函数依赖于过滤器扩展：

public function validate_ip($ip)

{

if (filter_var($ip,FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) === false)

{

return false;

}

self::$ip = sprintf('%u',ip2long($ip)); // you seem to want this

return true;

}

您的HTTP_X_FORWARDED_FOR代码段也可以简化：

// check for IPs passing through proxies

if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))

{

// check if multiple ips exist in var

if (strpos($_SERVER['HTTP_X_FORWARDED_FOR'],') !== false)

{

$iplist = explode(',$_SERVER['HTTP_X_FORWARDED_FOR']);

foreach ($iplist as $ip)

{

if ($this->validate_ip($ip))

return $ip;

}

}

else

{

if ($this->validate_ip($_SERVER['HTTP_X_FORWARDED_FOR']))

return $_SERVER['HTTP_X_FORWARDED_FOR'];

}

}

对此：

// check for IPs passing through proxies

if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))

{

$iplist = explode(',$_SERVER['HTTP_X_FORWARDED_FOR']);

foreach ($iplist as $ip)

{

if ($this->validate_ip($ip))

return $ip;

}

}

您可能还需要验证IPv6地址。

（编辑：安卓应用网）

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