yii2/tests/data/console/migrate_create/default.php

<?php

return <<<CODE
<?php

use yii\db\Migration;

class {$class} extends Migration
{
    public function safeUp()
    {

    }

    public function safeDown()
    {
        echo "{$class} cannot be reverted.\\n";

        return false;
    }

    /*
    // Use up()/down() to run migration code without a transaction.
    public function up()
    {

    }

    public function down()
    {
        echo "{$class} cannot be reverted.\\n";

        return false;
    }
    */
}

CODE;