DatabaseEffectivePid.php

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<?php
namespace TYPO3\CMS\Backend\Form\FormDataProvider;

/*
 * 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!
 */

use TYPO3\CMS\Backend\Form\FormDataProviderInterface;

class DatabaseEffectivePid implements FormDataProviderInterface
{
    public function addData(array $result)
    {
        $effectivePid = 0;
        if ($result['command'] === 'edit' && $result['tableName'] === 'pages') {
            $effectivePid = $result['databaseRow']['uid'];
        } elseif ($result['command'] === 'edit') {
            $effectivePid = $result['databaseRow']['pid'];
        } elseif ($result['command'] === 'new' && is_array($result['parentPageRow'])) {
            $effectivePid = $result['parentPageRow']['uid'];
        }
        $result['effectivePid'] = (int)$effectivePid;

        return $result;
    }
}