ResourceUtility.php

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<?php
namespace TYPO3\CMS\Core\Utility;

class ResourceUtility {
    public static function recursiveFileListSortingHelper($elementA, $elementB) {
        if (strpos($elementA, '/') === FALSE) {
            // first element is a file
            if (strpos($elementB, '/') === FALSE) {
                $result = self::nameCompareSortingHelper($elementA, $elementB);
            } else {
                // second element is a directory => always sort it first
                $result = 1;
            }
        } else {
            // first element is a directory
            if (strpos($elementB, '/') === FALSE)  {
                // second element is a file => always sort it last
                $result = -1;
            } else {
                // both elements are directories => we have to recursively sort here
                list($pathPartA, $elementA) = explode('/', $elementA, 2);
                list($pathPartB, $elementB) = explode('/', $elementB, 2);

                if ($pathPartA === $pathPartB) {
                    // same directory => sort by subpaths
                    $result = self::recursiveFileListSortingHelper($elementA, $elementB);
                } else {
                    // different directories => sort by current directories
                    $result = self::nameCompareSortingHelper($pathPartA, $pathPartB);
                }
            }
        }

        return $result;
    }

    static public function nameCompareSortingHelper($elementA, $elementB) {
        $result = strnatcasecmp($elementA, $elementB);
        if ($result === 0) {
            // Both are same in case insensitive so it's ok to check then now unnaturally.
            $result = strcmp($elementA, $elementB);
        }

        return $result;
    }
}