Making a valid zip file

[eluser]rschla104[/eluser]
made some progress

This puts all of the files into the zip properly, but doesn't keep the structure

Code:

$this->load->library('zip');

$dest = './folders/user01.zip';

$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator(getcwd().'/folders/user01/'));

foreach ($iterator as $key=>$value) {
   $this->zip->read_file($key);
}

$this->zip->archive($dest);

and if I pass read_file($key, TRUE) it makes the zip invalid again.