variables within a URL

I’m new here and I just need a little help for my university assignment.

I’m making a simple php shop and i have a database with categories and items. I found a way to make the categories display on the page and go to a certain link when clicked but because the categories are listed dynamically i want the url to be written dynamically too…

i have this so far:

[php]
if (isset($_GET[“cat_id”])) {
if ($_GET[“cat_id”] == $cat_id) {
//get items
$get_items_sql = “SELECT item_id, item_title, item_price FROM store_items WHERE cat_id = '”.$cat_id."’ ORDER BY item_title";

		   $get_items_res = mysqli_query($mysqli, $get_items_sql) or die(mysqli_error($mysqli));

		   if (mysqli_num_rows($get_items_res) < 1) {
				$display_block = "<p><em>Sorry, no items in this category :P.</em></p>";
		   		} 
			else {
				header("Location: http://mylink.com/");
				exit;
				}

			//free results
			mysqli_free_result($get_items_res);

		}
	}

[/php]

I want the link to have the category title variable so that it goes to a page that i will have built with the items of that category. something like:

http://mylink.com/‘cat_variable’.php

I hope I managed to explain myself and get some tips. Thanks.

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