SWDB/application/entity/Entity.php

<?php
    /**
     * Base entity file.
     *
     * Creates the entity and makes it available.
     *
     * @category Entity
     */

    /**
     * Entity superclass.
     *
     * Every other entity must inherit from this one. It represents a database
     * entity.
     * 
     * @abstract
     * @category Entity
     */
    abstract class Entity{

        /**
         * Constructor.
         *
         * Empty.
         */
        public function __construct(){

        }
    }
?>