PHP: Creating unique directory names - php

Question

if(!empty($_POST['newdir'])) {
$dir_base= preg_replace("/[^a-zA-ZÀ-ÿ0-9\s]/",'',$_POST['newdir']);
$dir_path=$pattern.$dir_base;
$dir_path_lwr = strtolower($dir_path);
$old_dirs = glob($pattern.'*', GLOB_ONLYDIR);
$old_dirs_lwr = array_map('strtolower', $old_dirs);
$i = 1;
$cond = true;
while($cond) {
if(in_array($dir_path_lwr, $old_dirs_lwr)) {
$i++;
$new_base=$dir_base.' '.$i.'';
$new_path= $pattern.$new_base;
$dir_path_lwr = strtolower($new_path);
}
elseif(!in_array($dir_path_lwr, $old_dirs_lwr)) {
mkdir($dir_path, 0755);
$cond = false;
}
}
}
EDIT Have changed the above to the most recent version. For testing, I am now simply echoing out the $cond var rather than creating directories all over the place. The 'Not In' argument works fine - when a duplicate name IS found, the page takes about 10 to 12 seconds to load, before white screening. There's something wrong with my while loop i think...
What I'm trying to do is:
Submit a new directory name to the script
Clean and escape that name
Check it against existing directories in that location ($pattern)
If there is no conflict, create the directory (works)
If there is a conflict, append a number (eg, My Directory 2) and then create the directory (doesn't work)
So, basically how to check against existing file names, and create a uniquely name directory dynamically. All help appreciated :)

Answer 1

Fixed it - i was confusing the vars within the loop.
Posting for future reference:
if(!empty($_POST['newdir'])) {
$dir_base= preg_replace("/[^a-zA-ZÀ-ÿ0-9\s]/",'',$_POST['newdir']);
$dir_path=$pattern.$dir_base;
$dir_path_lwr = strtolower($dir_path);
$old_dirs = glob($pattern.'*', GLOB_ONLYDIR);
$old_dirs_lwr = array_map('strtolower', $old_dirs);
$i = 1;
$cond = true;
while($cond) {
if(in_array($dir_path_lwr, $old_dirs_lwr)) {
$i++;
$new_base=$dir_base.' '.$i.'';
$dir_path= $pattern.$new_base;
$dir_path_lwr = strtolower($dir_path);
}
elseif(!in_array($dir_path_lwr, $old_dirs_lwr)) {
mkdir($dir_path, 0755);
$cond = false;
}
}
}