How to get client IP address using PHP at server side?

Question

How to get User IP address using PHP script? I want to display visitor IP address using PHP Code.

Answer 1

You can use $_SERVER['REMOTE_ADDR'] like this:

<?php
echo $_SERVER['REMOTE_ADDR'];
?>

There is also another example that can detect IP address behind proxy:

<?php
function GetIP(){
  $ipaddress =  array();
  if (isset($_SERVER['HTTP_CLIENT_IP']))
      $ipaddress[] = $_SERVER['HTTP_CLIENT_IP'];
  if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
      $ipaddress[] = $_SERVER['HTTP_X_FORWARDED_FOR'];
  if(isset($_SERVER['HTTP_X_FORWARDED']))
      $ipaddress[] = $_SERVER['HTTP_X_FORWARDED'];
  if(isset($_SERVER['HTTP_FORWARDED_FOR']))
      $ipaddress[] = $_SERVER['HTTP_FORWARDED_FOR'];
  if(isset($_SERVER['HTTP_FORWARDED']))
      $ipaddress[] = $_SERVER['HTTP_FORWARDED'];
  if(isset($_SERVER['REMOTE_ADDR']))
      $ipaddress[] = $_SERVER['REMOTE_ADDR'];
      
  $ips = implode(", ", array_unique($ipaddress));
  return $ips;
}
?>