Submitting Form Replaces Constant Get Information That Is Needed For The Page

I'm learning php and I've got to say I've googled everywhere and I'm stuck :( My question is, in other words, how can I get new variables added to previous variables on the page? I

Solution 1:

Instead of submitting to an action URL with part of the query string already filled out, use a hidden input field to hold the values of the variables you want to be fixed. See if you can get your PHP script to generate a form like this:

<formaction="getvartest.php"method="get"><inputtype="hidden"name="orgvar"value="12345" /><selectname="varselection"><optionvalue="selection1">selection1</option><optionvalue="selection2">selection2</option></select><inputtype="submit" /></form>

Perhaps something like:

<inputtype="hidden"name="orgvar"value="<?= htmlspecialchars($_GET['orgvar']) ?>" />

(The htmlspecialchars() call escapes characters like <, &, and " just in case there are any of these in orgvar.)

Or if you wanted to save every query parameter you could use a generic loop like:

<?phpforeach ($_GETas$name => $value) { ?><inputtype="hidden"name="<?= htmlspecialchars($name)  ?>"value="<?= htmlspecialchars($value) ?>" /><?php } ?>