It should be noted that it is not always safe to iterate through the database while changing it at the same time. For example:<?php$db=dba_open(...);// remove all values shorter than 10 charactersfor ($key=dba_firstkey($db); $key!==false; $key=dba_nextkey($db)) { $s=dba_fetch($key, $db); if (strlen($s)<10) { dba_delete($key, $db); }}?>The above example will work fine with db4 handler, but not with gdbm. It is handler specific.