'yii\db\Connection', 'dsn' => "mysql:host=$db_host;dbname=$db_name", 'username' => env('DB_USER'), 'password' => env('DB_PASS'), 'charset' => 'utf8', // Schema cache options (for production environment) //'enableSchemaCache' => true, //'schemaCacheDuration' => 60, //'schemaCache' => 'cache', ];