php: submit form to current page keeping current url variables

[unwashed potato!]

got a small problem google doesn't seem to have an answer for

i have a page with a few variables in the url which are required, if they aren't there the user is redirected to another page.

on the page i also have a small form which filters out what is displayed. the trouble i'm having is getting the form to submit the information using the get method and add a & rather then ? to the current url variables.

i currently do a for loop to make a string of whats in the url. it's then getting the form to realise variables are already there so another ? isn't needed.

thanks.

hope that made sense, me getting rather sleepy

 

[unwashed potato!]

<form action="<?php echo htmlentities($_SERVER['REQUEST_URI']); ?>" method="get">

had already tried this and didn't work, still removed all the variables some reason

think it'll be marcs suggestion then.

thanks guys