codejobs - How to know the user's browser? - PHP

browser.php

<?php
function browser() {
	$browsers = array(
		  "Opera" 		=> "(Opera)",
		  "Mozilla Firefox"	=> "((Firebird)|(Firefox))",
		  "Galeon" 		=> "(Galeon)",
		  "Mozilla"		=> "(Gecko)",
		  "MyIE"		=> "(MyIE)",
		  "Lynx" 		=> "(Lynx)",
		  "Netscape" 		=> "((Mozilla/4\.75)|(Netscape6)|(Mozilla/4\.08)|(Mozilla/4\.5)|(Mozilla/4\.6)|(Mozilla/4\.79))",
		  "Konqueror"	        => "(Konqueror)",
		  "Internet Explorer 9" => "((MSIE 9\.[0-9]+))",		  
		  "Internet Explorer 8" => "((MSIE 8\.[0-9]+))",
		  "Internet Explorer 7" => "((MSIE 7\.[0-9]+))",
		  "Internet Explorer 6" => "((MSIE 6\.[0-9]+))",
		  "Internet Explorer 5" => "((MSIE 5\.[0-9]+))",
		  "Internet Explorer 4" => "((MSIE 4\.[0-9]+))",
		  "Chrome"              => "((Chrome))"
	);

	foreach($browsers as $browser => $pattern) {
		if(preg_match($pattern, $_SERVER["HTTP_USER_AGENT"])) {
			if($browser == "Mozilla") {
				if(strstr($_SERVER["HTTP_USER_AGENT"], "Chrome") !== FALSE) {
					return "Google Chrome";
				}
				
				if(strstr($_SERVER["HTTP_USER_AGENT"], "Safari") !== FALSE) {
					return "Safari";
				}
			} else {
				$browser = str_replace(" 9", "", $browser);
				$browser = str_replace(" 8", "", $browser);
				$browser = str_replace(" 7", "", $browser);
				$browser = str_replace(" 6", "", $browser);
				
				return $browser;	
			}
		}
	}
	
	return "Unknown";
}
?>