Files.php

<?
$userFilterIsCallable = is_callable($userFilter)
/**
 * Anonymous function to filter the DirectoryIterator's results
 *
 * @param $fileInfo \SplFileInfo Current file's FileInfo
 * @param $pathname string       Current file's path
 * @param $iterator RecursiveCallbackFilterIterator
 * @return boolean true if the current element is acceptable, otherwise false.
 */
$filter = function ($fileInfo, $pathname, $iterator) use ($returnDotFiles, $suffix, $suffixLength, $userFilter, $userFilterIsCallable) {
	$return = FALSE;
	$filename = $fileInfo->getFilename();
	if ($returnDotFiles === FALSE && $filename[0] === '.') {
		$return = FALSE;
	} elseif (($fileInfo->isFile() && ($suffix === NULL || substr($filename, -$suffixLength) === $suffix)) || $iterator->hasChildren()) {
		$return = TRUE;
	}
	if ($userFilterIsCallable) {
		$return = $userFilter($fileInfo, $pathname, $iterator, $filename, $returnDotFiles, $suffix, $suffixLength, &$return);
	}
	return $return;
};