This PHP script detects browser and redirects to a different link for each browser. I made this for my Docs Online Viewer banner.

Browser based redirect

<?php
	/*
		Detects browser and redirects to a different link for each browser.
	*/
	$browser = $_SERVER['HTTP_USER_AGENT'];
	$chrome = '/Chrome/';
	$firefox = '/Firefox/';
	$ie = '/MSIE/';
	if (preg_match($chrome, $browser)){
		//echo "chrome/opera";
		header( 'Location: https://chrome.google.com/webstore/detail/docs-online-viewer/gmpljdlgcdkljlppaekciacdmdlhfeon?hl=en' ) ;
	}
	elseif (preg_match($firefox, $browser)){
		//echo "firefox";
		header( 'Location: https://addons.mozilla.org/en-us/firefox/addon/docs-online-viewer/' ) ;
	}
	elseif (preg_match($ie, $browser)){
		//echo "internet_explorer";
		header( 'Location: http://www.deekshith.in/p/docs-online-viewer.html' ) ;
	}
	else{
		header( 'Location: http://www.deekshith.in/p/docs-online-viewer.html' ) ;
	}
?>