php獲取本地實際IP

function real_ip()

{

static $realip = NULL;

if ($realip !== NULL)

{

return $realip;

}

if (isset($_SERVER))

{

if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))

{

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

foreach ($arr AS $ip)

{

$ip = trim($ip);

if ($ip != 'unknown')

{

$realip = $ip;

break;

}

}

}

elseif (isset($_SERVER['HTTP_CLIENT_IP']))

{

$realip = $_SERVER['HTTP_CLIENT_IP'];

}

else

{

if (isset($_SERVER['REMOTE_ADDR']))

{

$realip = $_SERVER['REMOTE_ADDR'];

}

else

{

$realip = '0.0.0.0';

}

}

}

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');

}

}

preg_match("/[\d\.]{7,15}/", $realip, $onlineip);

$realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

return $realip;

}

總結

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