Violação do princípio de responsabilidade única - SOLID

srp-solid-violate.php

<?php

class Order
{
    public function calculateTotalSum(){/*...*/}
    public function getItems(){/*...*/}
    public function getItemCount(){/*...*/}
    public function addItem($item){/*...*/}
    public function deleteItem($item){/*...*/}

    public function printOrder(){/*...*/}
    public function showOrder(){/*...*/}

    public function load(){/*...*/}
    public function save(){/*...*/}
    public function update(){/*...*/}
    public function delete(){/*...*/}
}

// Reference: https://www.apphp.com/tutorials/index.php?page=solid-principles-in-php-examples