Some testing, try to guess what it does:
Code:
$uid = io_user_id('ioFTPD');
$uhandle = io_user_open($uid);
$text = io_user_print($uhandle);
io_user_lock($uhandle);
io_user_lock($uhandle);
io_user_close($uhandle);
$ulist = io_user_list_init();
while (($id = io_user_list_fetch($ulist)) >= 0) {
$uname = io_user_name($id);
echo "User: $uname<br>";
}
io_user_list_close($ulist);