function parse_routes() {
	
	$route = '/action/(int)a/(str)b';
	$path = '/action/100/moo';
	$vars = array();
	
	$path = preg_split("~/~", $path, -1, PREG_SPLIT_NO_EMPTY);
	
	preg_match_all("~\((?P<type>[a-z]+)\)(?P<var>[^/]*)~i", $route, $matches, PREG_SET_ORDER);
	
	$i = 1;
	foreach($matches as $match) {
		
		if(isset($match['type']) && $match['type'] != '') {
			$fn = $match['type'] .'val';
		
			$vars[$match['var']] = $fn($path[$i]);
		}
		$i++;
	}
	
	print_r($vars);
}

parse_routes();