Dropdown list with New folder option in PHP - php

Question

I have this script that gets all the sub-directories and puts them into a dropdown list.
I have an option "New folder" to create a new folder by gathering the folder name - in this case, it's numbers like 995 - and discount it by one to create a dir called 994
<form action="index.php" method="post">
<select name="folderchoose" id="folderchoose" onchange="this.form.submit();">
<?php
$base = basename("$items[1]", ".php").PHP_EOL;
$newbase = $base -1;
if($_POST['folderchoose']==0){ mkdir("../albums/$newbase", 0700); }
$items = glob("../albums/*", GLOB_ONLYDIR);
natsort($items);
{?><option>select:</option><?
foreach($items as $item)
{
?> <option value="1"><? echo "$item\n "; ?></option><?
} ?> <option value="0" >New folder</option> <?
}
?>
</select>
</form>
Directory:<?php echo $_POST[folderchoose] ?><br />
<?php $base = basename("$items[1]", ".php").PHP_EOL;
$newbase = $base -1;
echo $newbase ?>
Two things aren't working properly: the mkdir function doesn't get the $newbase and create a directory called dir(??) automatically even if I'm not choosing 'New Folder'.

Answer 1

I have a couple of hints for you to improve your code. I do not fully understand your problem but this might help.
If you want to list a directory with all of its sub directories you should do something like this
function list_directory( $dirname ) {
foreach file in directory
if(is_dir($dirname)){
list_directory($dirname)
}
if(is_File($dirname)){
echo $dirname;
}
}
}
This is not usable code but a genral idea for you to work with.
If strange things start happening try doing this
var_dump( $var ); // The variable your are suspecting in your case $newbase

Answer 2

You need to change if($_POST['folderchoose']==0) to something else because 0 mean "null" and therefore the if statement is true and it will be executed.
or... Use isset() to make sure the form really get submitted, for example
if (isset($_POST['folderchoose'])) {
if ($_POST['folderchoose'] == 0) {
//do mkdir or something