I can not remove folder

Okay it's my fault. I changed this

Old code (not work)

PHP Code:

$delete_folder = rmdir($path);  
if (!$delete_folder) { // always this works begin
                    $alert = array(
                        "title" => "Error",
                        "text" => "problem occurred- ALWAYS WORK THIS IF",
                        "type" => "error"
                    );
                } // always this works end
                // session
                $this->session->set_flashdata("alert", $alert);
                redirect(base_url("galleries"));
                die; 


New code (it works)

PHP Code:

    $delete_folder = delete_files($path);
                if (!$delete_folder) {
                    $alert = array(
                        "title" => "Error",
                        "text" => "problem occurred-.",
                        "type" => "error"
                    );
                    $this->session->set_flashdata("alert", $alert);
                    redirect(base_url("galleries"));
                }
            }