Redirect if browser isn't firefox?

How do I redirect if my users don't use firefox? Thanks in advance,

Xabber.

 

$redirect="http://www.redirecturlgoeshere.net";
if(preg_match('/Firefox/',$_SERVER['HTTP_USER_AGENT']))!=1) header("Location: ".$redirect);

user http_user_agent to detect the browser

 

<?php
if(!strstr($_SERVER['HTTP_USER_AGENT'], 'Firefox')) {
  // not using Firefox (or spoofed UA) - redirect
  header('Location: http://www.example.com/redirect-here/');
  exit();
}

PHP:

 

Thanks man!