Creating folders with mkdir()

Hey. I'm trying to put together a form where I can add folders to a subfolder - the values seem to pass just fine, but no folder is being made, and I'm a bit at a loss as to why.

Here's the code:

function add_picture_folder()
{
$new_folder = $_POST['folder_name'];
$img_folder = "images/";
$med_folder = "images/".$new_folder."/medium/";
$thumbs = "images/".$new_folder."/thumbs/";
$combined = "$img_folder"."$new_folder"."/";

global $access_warning;
if(!session_is_registered(user_name)) {
	echo $access_warning;
} else { 
	if (isset($_POST['submit'])) { 
		//if (!is_dir($combined)) {
			mkdir("$combined",0755,true);
		//}
	//$med_folder = "images/medium/";
		//echo $med_folder;
	/*if (!is_dir($med_folder)) {
			mkdir($med_folder);
		}
	$tn_folder = "images/".$new_folder."/thumbs/";
		if (!is_dir($tn_folder)) {
			mkdir($tn_folder);
		}*/
	}
	else { ?>
<fieldset id="add_pic_folder"><legend><a href="javascript:toggleLayer('add_pic_form');" title="Legger til mapper som senere kan brukes til å lagre bilder i">Legger til mapper for bildelagring</a></legend>
<form id="add_pic_form" method="post" action="<?php echo "$domain"; ?>/index.php?page=admin#add_pic_folder">
	<p><label>Skriv inn mappenavn:</label><input class="formlook" type="text" name="folder_name" value="<?php echo $combined; ?>" /></p>
	<p><input class="button" type="submit" value="Legg til mappe" /></p>
</form>
<p class='urls'><a class='menu' href='#toppen'>Tilbake til toppen</a></p></fieldset>
</fieldset>
<?php }}}

PHP:

Some of it is commented out, just to make sure none of the error-checking would be causing the problem - even with just a "if submit" and a value, it doesn't work - anyone have any insight why?

The $img_folder is predefined, and is present on the server. What I would like to do is for this form to add a subfolder to that folder, for instance images/testfolder/ and then add another two subfolders to that new subfolder, like this: images/testfolder/medium and images/testfolder/thumbs - I've tried reading up on this, and I can't really see why it shouldn't work the way I have it.

Anyone?

 

And, to answer myself... It was me being stupid, and using (isset($_POST['submit'])) instead of (isset($_POST['folder_name'])) - got it working just fine now...

 

Step one of debugging almost any problem: add this at the top and then take a good long look at the output.

echo "<pre>"; var_dump($_REQUEST); echo "</pre>";

Code (markup):