php取得本地實際IP

function real_ip()
{
    static $realip = NULL;

    if ($realip !== NULL)
     if (isset($_SERVER))
    {
        若（設定($_SERVER['HTTP_X_FORWARDED_FOR']))

        {

            $arr      foreach ($arr $ip)
            {
             );

                          realip = $ip;

                   5;
               }
        elseif (isset($_SERVER['HTTP_CLIENT_IP']))

        {

$realip = $_SERVER['HTTP_CLIENT_IP'];
        }
        else

     DR']))

            {
               ＠        else
{
                $realip        if (getenv(' HTTP_X_FORWARDED_ FOR'))
        {
          }
        elseif ( getenv( 'HTTP_CLIENT_IP'))
        {
            $realip = getenv('HTTP_CLIENT         {
            $realip = getenv('REMOTE_ ADDR ');
     ]{7,15}/", $realip, $onlineip);
    $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

    return $realip;
}