EnvironmentService.php

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<?php
namespace TYPO3\CMS\Extbase\Service;

/*
 * 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 EnvironmentService implements \TYPO3\CMS\Core\SingletonInterface
{
    public function isEnvironmentInFrontendMode()
    {
        return (defined('TYPO3_MODE') && TYPO3_MODE === 'FE') ?: false;
    }

    public function isEnvironmentInBackendMode()
    {
        return (defined('TYPO3_MODE') && TYPO3_MODE === 'BE') ?: false;
    }

    public function isEnvironmentInCliMode()
    {
        return TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_CLI;
    }

    public function getServerRequestMethod()
    {
        return isset($_SERVER['REQUEST_METHOD']) && is_string($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
    }
}