do not return files whose filename do not start with a _

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@5835 7882d7ee-46e0-0310-a255-a28a61b628e4
Added errorchecking

git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@5836 7882d7ee-46e0-0310-a255-a28a61b628e4