EBookInterface.php

<?php

namespace DesignPatterns\Structural\Adapter;

/**
 * EBookInterface is a contract for an electronic book
 */
interface EBookInterface
{
    /**
     * go to next page
     *
     * @return mixed
     */
    public function pressNext();

    /**
     * start the book
     *
     * @return mixed
     */
    public function pressStart();
}