How to get the IP address of the client/user in PHP?

PHP - Interview Questions

You can use $_SERVER['REMOTE_ADDR'] to get IP address of user/client in PHP, But sometime it may not return the true IP address of the client at all time. Use Below code to get true IP address of user.

function getTrueIpAddr(){
 if (!empty($_SERVER['HTTP_CLIENT_IP']))   //check ip from share internet
    {
      $ip=$_SERVER['HTTP_CLIENT_IP'];
    }
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))   //to check ip is pass from proxy
  {
      $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
  }
    else
  {
      $ip=$_SERVER['REMOTE_ADDR'];
  }
    return $ip;
}