FileNameFilter.php

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

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class FileNameFilter
{
    protected static $showHiddenFilesAndFolders = false;

    public static 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;
        }
    }

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

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