Browsers dont go back to the server when you give them an internal ("#") link. Even when you think adding get-parameters would work, it often doesn't due to caching, so you can either

a) Add random data to the end of the link:\
 <a href="mypage.php?important=data&random=ahadhqw#internallink">link</a>
b) Use javascript nastyness:
<a href="mypage.php#bob" onclick="getdata('mypage.php')">link</a>

If your php page returns a constant result (up to arguments) then the caching problem goes away, and you can just use ?get=args#internallink. Note that the ? must come before the #.