FileNameFilter.php

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<?php
namespace TYPO3\CMS\Core\Resource\Filter;

class FileNameFilter {

    static protected $showHiddenFilesAndFolders = FALSE;

    static public function filterHiddenFilesAndFolders($itemName, $itemIdentifier, $parentIdentifier, array $additionalInformation, \TYPO3\CMS\Core\Resource\Driver\DriverInterface $driverInstance) {
        // Only apply the filter if you want to hide the hidden files
        if (self::$showHiddenFilesAndFolders === FALSE && strpos($itemIdentifier, '/.') !== FALSE) {
            return -1;
        } else {
            return TRUE;
        }
    }

    static public function getShowHiddenFilesAndFolders() {
        return self::$showHiddenFilesAndFolders;
    }

    static public function setShowHiddenFilesAndFolders($showHiddenFilesAndFolders) {
        return self::$showHiddenFilesAndFolders = (bool) $showHiddenFilesAndFolders;
    }

}