Migrations tutorial step 2

gistfile1.txt

<?php

use Phinx\Migration\AbstractMigration;
use Phinx\Db\Adapter\MysqlAdapter;

class CartItems extends AbstractMigration {

    public function up() {
        $table = $this->table('cart_items');
        $table->addColumn('user_id', 'integer')
              ->addColumn('product_id', 'integer', array('limit' => MysqlAdapter::INT_BIG))
              ->addColumn('subtype_id', 'integer', array('limit' => MysqlAdapter::INT_SMALL))
              ->addColumn('quantity', 'integer',   array('limit' => MysqlAdapter::INT_TINY))
              ->create();
    }

    public function down() {
        $this->dropTable('posts');
    }
}