yii2 backend config file for different sessions

<?php
$params = array_merge(
    require(__DIR__ . '/../../common/config/params.php'),
    require(__DIR__ . '/../../common/config/params-local.php'),
    require(__DIR__ . '/params.php'),
    require(__DIR__ . '/params-local.php')
);

return [
    'id' => 'app-backend',
    'basePath' => dirname(__DIR__),
    'controllerNamespace' => 'backend\controllers',
    'bootstrap' => ['log'],
/*
     'modules' => [
    'gii' => [
        'class' => 'yii\gii\Module',
        'allowedIPs' => ['127.0.0.1', '::1', '192.168.0.*', '180.211.110.194'] // adjust this to your needs
    ],
],
 */
     'modules' => [
        'settings' => [
            'class' => 'backend\modules\settings\Settings',
        ],
    ],

    'components' => [
 'user' => [
      'identityClass' => 'backend\models\Admin',
      'enableAutoLogin' => true,
      'enableSession' => true,
      'identityCookie' => [
                'name' => '_backendUser', // unique for backend
            ],

],
         'session' => [
            'name' => 'PHPBACKSESSID',
            'savePath' => sys_get_temp_dir(),
        ],
        'request' => [
            // !!! insert a secret key in the following (if it is empty) - this is required by cookie validation
            'cookieValidationKey' => 'qqsdfsdzgsdfgsdgsdgqq',
            'csrfParam' => '_backendCSRF',
        ],
        'log' => [
            'traceLevel' => YII_DEBUG ? 3 : 0,
            'targets' => [
                [
                    'class' => 'yii\log\FileTarget',
                    'levels' => ['error', 'warning'],
                ],
            ],
        ],
        'errorHandler' => [
            'errorAction' => 'site/error',
        ],
    ],
    'params' => $params,
];