(PHP 5)
DirectoryIterator::isDir — Determine if current DirectoryIterator item is a directory
Determines if the current DirectoryIterator item is a directory.
This function has no parameters.
   Returns TRUE if it is a directory, otherwise FALSE
  
Example #1 DirectoryIterator::isDir() example
This example lists the directories within the directory of the current script.
<?php
$iterator = new DirectoryIterator(dirname(__FILE__));
foreach ($iterator as $fileinfo) {
    if ($fileinfo->isDir()) {
        echo $fileinfo->getFilename() . "\n";
    }
}
?>
The above example will output something similar to:
. .. apples bananas pears