Description:
------------
Reading a directory with a DirectoryIterator using an 
ftp wrapper doesn't work well.
Tested on 3 ftp servers. (proftp, ncftp, and ..unknown 
:-/). on 3 different machines and network.
With proftp and ncftp, some items are missing from the 
retrieved directory list. (whereas it works well with 
readdir()), even with a directory containing no more 
than 2 or 3 files. This doesn't seem to be related to 
the nature of the file, but rather to its position in 
the list : add a new file to the directory, and the 
previously missing file would show up, while another one 
is now missing.

On the third server (ftpperso.free.fr), the directory 
was correctly read.
In all cases, retrieving the list is very slow, and 
often fails.


Reproduce code:
---------------
example:

$dir = new DirectoryIterator("ftp://myftpserver.com/");

foreach ( $dir as $f ) {
 if ( $f->isDot() ) continue;
 echo $f->getFilename()."\n";
}