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<?php

// returns first forwarded IP match it finds
function forwarded_ip() {
  $keys = array(
    'HTTP_X_FORWARDED_FOR', 
    'HTTP_X_FORWARDED', 
    'HTTP_FORWARDED_FOR', 
    'HTTP_FORWARDED',
    'HTTP_CLIENT_IP', 
    'HTTP_X_CLUSTER_CLIENT_IP', 
  );
  
  foreach($keys as $key) {
    if(isset($_SERVER[$key])) {
      $ip_array = explode(',', $_SERVER[$key]);
      foreach($ip_array as $ip) {
        $ip = trim($ip);
        return $ip;
      }
    }
  }
  return '';
}

$remote_ip = $_SERVER['REMOTE_ADDR'];
$forwarded_ip = forwarded_ip();
  
?>

Remote IP Address: <?php echo $remote_ip; ?><br />
<br />

<?php if($forwarded_ip != '') { ?>
  Forwarded For: <?php echo $forwarded_ip; ?><br />
  <br />
<?php } ?>