A simple classless PHP regex router function

.htaccess

RewriteEngine On

RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-f

RewriteRule ^(.*)$ ./router.php/$1 [QSA]

Router.php

<?php

function route($regex, $callback) {
	$regex = '/^' . str_replace('/', '\/', $regex) . '$/';
	if (preg_match($regex, $_SERVER['REQUEST_URI'], $params)) {
		array_shift($params);
		return call_user_func_array($callback, array_values($params));
	}
}

route('blog/(\w+)/(\d+)', function($category, $id){
	print $category . ':' . $id;
	die(); //stop processing more routes
});

?>