The example is a bit misleading. The isDot call is there to remove the first three entries (the "." directory twice and then the ".." directory), which should not be there anyway because the default mode is "LEAVES_ONLY" and hence the directories should not be shown anyway.
The SPL iterators are designed for use in foreach. See http://bugs.php.net/bug.php?id=44063
In this case, the isDot call should be removed and a rewind call before the loop should be added.
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Probable Submitter: 93.108.152.52
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Manual Page -- http://www.php.net/manual/en/recursivedirectoryiterator.construct.php
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