Browser detection with php

This tutorial explains how to make a code only works in one separated browser, I think that's useful to correct incompatibility of page style in some browsers.

In your page, put:

1.2.
3.$user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
4.if(strpos($user_agent, 'Opera') !== false)
5.{
6. echo 'code for Opera';
7.}
8.elseif(strpos($user_agent, 'Gecko') !== false)
9.{
10. echo 'code for Mozilla/Firefox';
11.}
12.elseif(strpos($user_agent, 'MSIE') !== false)
13.{
14. echo 'code for IE';
15.}
16.else
17.{
18. echo 'some other browser';
19.}
20.
21.?>