Dynamically generating folders?

[eluser]markanderson993[/eluser]
One small question, I took your advice on randomizing folder names to heart. So I wrote a script to create a random folder name if the folder does not already exist. I am not receiving any errors but could you please glance over this to make sure it really is doing what it should be? Thanks a bunch

Code:

# Create a random directory name for user
            $this->ci->load->library('functions');
            
            $upload_folder = $this->ci->functions->randomise();
            
            $this->ci->db->select('upload_folder');
            $get_users_upload_folders = $this->ci->db->get('users');
            $upload_folders_array = $get_users_upload_folders->result();
            if (in_array($upload_folder, $upload_folders_array))
            {
                $redo_randomise = TRUE;
            } else {
                $redo_randomise = FALSE;
            }
            
            while ($redo_randomise)
            {
                $upload_folder = $this->ci->functions->randomise();
                $get_users_upload_folders = $this->ci->db->get('users');
                $upload_folders_array = $get_users_upload_folders->result();
                $this->ci->db->select('upload_folder');
                if (in_array($upload_folder, $upload_folders_array))
                {
                    $redo_randomise = TRUE;
                } else {
                    $redo_randomise = FALSE;
                }
            }
            
            mkdir('../uploads/'.$upload_folder.'/');