loop over directories "the right way"

See http://php.net/manual/en/function.readdir.php - specifically

    /* This is the correct way to loop over the directory. */
    while (false !== ($entry = readdir($handle))) {
        echo "$entry\n";
    }

    /* This is the WRONG way to loop over the directory. */
    while ($entry = readdir($handle)) {
        echo "$entry\n";
    }

Looping over a directory the wrong way will cause the loop to stop if it comes to a directory named 0 (or anything else which evaluates to false)

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