zxcms/environments/prod/common/config/main-local.php

<?php
return [
    'components' => [
        'db' => [
            'class' => 'yii\db\Connection',
            //'dsn' => 'mysql:host=localhost;dbname=zxcms',
            'dsn' => '',
            'username' => '',
            'password' => '',
            'charset' => 'utf8mb4',
        ],
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            'viewPath' => '@common/mail',
        ],
    ],
];