PHP - hide url (GET) parameters

Question

I have a link in my PHP/HTML like this:

Answer 1

Agree on and encryption/hash approach (MD5 for example). Then have a reprocessing page that decrypts the message before calling the required script. I'm doing this in php... Just to show you the idea.

eg. www.mydomain.com/preporcessor.php?request=qouiapfiwe0i9qrr9qyy83r34rqejl

preprocessor.php (pseudo code)

$request = $_REQUEST["request"];
$decrypted = mydecryptfunction($request);
//$decrypted will now contain: targetpage=login.php?username=abc&password=34453js&location=ABJ...
//Now you can route the parameters to login.php. 

Note that mydecryptfunction($request) is a function you will create.