Description:
------------
Many functions perform operation like fetch data from database and return value should be cached.
Standard solution:

function get_visible_pages(){
	static $return = false;
	if($return === false){
		$return = fetch_visible_pages_from_db();
	}
	return $return;
}

I think php shold automate this in way like:

cached function get_visible_pages(){
	$return = fetch_visible_pages_from_db();
	return $return;
}

Thanks!