backend/config/main.php

<?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',
        'homeUrl'             => '/admin',
        'basePath'            => dirname(__DIR__),
        'controllerNamespace' => 'backend\controllers',
        'bootstrap'           => [ 'log' ],
        'controllerMap'       => [
            'settings' => 'artweb\artbox\core\controllers\SettingsController',
            'profile'  => 'artweb\artbox\core\controllers\ProfileController',
            'page'     => 'artweb\artbox\core\controllers\PageController',
            'seo'      => 'artweb\artbox\core\controllers\AliasController',
        ],
        'modules'             => [
            'imagemanager' => [
                'class'                => 'noam148\imagemanager\Module',
                'canUploadImage'       => true,
                'canRemoveImage'       => function () {
                    return true;
                },
                'setBlameableBehavior' => false,
                'cssFiles'             => [
                    'https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css',
                ],
            ],
        ],
        'components'          => [
            'assetManager' => [
                'bundles' => [
                    'yiister\gentelella\assets\ThemeAsset' => [
                        'sourcePath' => '@backend/assets/',
                        'js'         => [
                            'js/custom.js',
                        ],
                        'css'        => [
                            'css/custom.css',
                        ],
                    ],
                ],
            ],
            'filedb'       => [
                'class' => 'yii2tech\filedb\Connection',
                'path'  => '@common/config',
            ],
            'imagemanager' => [
                'class'       => 'noam148\imagemanager\components\ImageManagerGetPath',
                'mediaPath'   => dirname(dirname(__DIR__)) . '/storage',
                'cachePath'   => 'assets/images',
                'useFilename' => true,
                'absoluteUrl' => false,
            ],
            'request'      => [
                'csrfParam' => '_csrf-backend',
                'baseUrl'   => '/admin',
            ],
            'user'         => [
                'identityClass'   => 'artweb\artbox\core\models\User',
                'enableAutoLogin' => true,
                'identityCookie'  => [
                    'name'     => '_identity-backend',
                    'httpOnly' => true,
                ],
            ],
            'session'      => [
                // this is the name of the session cookie used for login on the backend
                'name' => 'advanced-backend',
            ],
            'log'          => [
                'traceLevel' => YII_DEBUG ? 3 : 0,
                'targets'    => [
                    [
                        'class'  => 'yii\log\FileTarget',
                        'levels' => [
                            'error',
                            'warning',
                        ],
                    ],
                ],
            ],
            'errorHandler' => [
                'errorAction' => 'site/error',
            ],
            'urlManager'   => [
                'enablePrettyUrl' => true,
                'showScriptName'  => false,
                'rules'           => [],
            ],
        ],
        'params'              => $params,
    ];