Identify the user's browser

Sometimes there arises a need to identify the user's browser.

It is pretty easy to find browser with jquery. So if you have included jquery in your page, it takes a simple line to identify the browser: 

if ($.browser.msie) {} // IE

if (($.browser.msie) && ($.browser.version == '6.0')) {} // IE6

if ($.browser.opera) {} // opera
if ($.browser.mozilla) {} // Firefox

With the help of php, you can get the browser 

details with the help of: 

$_SERVER['HTTP_USER_AGENT'];

Or you can even use the combined version of php and javascript.
php + javascript code:

<script type="text/javascript">
var string1 = "<?php echo $_SERVER['HTTP_USER_AGENT']; ?>"; // Browser string

var myRegExp1 = /Firefox/;
var matchPos1 = string1.search(myRegExp1);

var myRegExp2 = /Chrome/;
var matchPos2 = string1.search(myRegExp2);

var myRegExp3 = /MSIE/;
var matchPos3 = string1.search(myRegExp3);

if(matchPos1 != -1)
document.write("Firefox was found");

else if(matchPos2 != -1)
document.write("Chrome was found");

else if(matchPos3 != -1)
document.write("Internet Explorer was found");

else
document.write("Neither Firefox, IE or chrome was found");

</script>

Try this code in different browsers and see the difference. Enjoy :)