如何在yii2中更改参数？

return [
    // ...
    'components' => [
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=mydatabase',
            'username' => 'myuser',
            'password' => 'mypassword',
            'charset' => 'utf8',
        ],
        // 其他组件配置
    ],
    // ...
];

use Yii;

// 动态设置数据库连接参数
Yii::$app->components['db']['dsn'] = 'mysql:host=newhost;dbname=newdatabase';
Yii::$app->components['db']['username'] = 'newuser';
Yii::$app->components['db']['password'] = 'newpassword';

return [
    // ...
    'components' => [
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => getenv('DB_DSN'),
            'username' => getenv('DB_USERNAME'),
            'password' => getenv('DB_PASSWORD'),
            'charset' => 'utf8',
        ],
        // 其他组件配置
    ],
    // ...
];