Show user information (IP address, Browser (User Agent), Referrer)

index.php

<?php
$ip = $_SERVER['REMOTE_ADDR'];
$browser = $_SERVER['HTTP_USER_AGENT'];
$referrer = $_SERVER['HTTP_REFERER'];
  if ($referred == "") {
    $referrer = "This page was accessed directly";
  }
echo "<b>Visitor IP address:</b><br/>" . $ip . "<br/>";
echo "<b>Browser (User Agent) Info:</b><br/>" . $browser . "<br/>";
echo "<b>Referrer:</b><br/>" . $referrer . "<br/>";
?>