Ok, so I have let's say this page `http://mypage.com/index.php?id=something`. I want to have in this page the link which would go to the `http://mypage.com/index.php?id=something&sub=1`. And to do that I have to add `a href` to my index.php file like this   

`echo '<a href="index.php?id=something&sub=1">go here</a>';`. Is it possible to do this thing shorter? I mean just adding `sub=1` somehow? Thanks.