battles/classes/Battles/ShopItem.php

<?php
namespace Battles;
use Battles\Database\DBPDO;

class ShopItem extends Item
{
    public function printInfo()
    {
        parent::printAllInfo();
    }

    public function buyItem($owner)
    {
        if ($owner) {
            $db = new DBPDO();
            $query = "INSERT INTO inventory (
                       owner_id, name, item_type, durability, price, 
                       need_strength, need_dexterity, need_intuition, 
                       need_endurance, need_intelligence, need_wisdom, 
                       add_strength, add_dexterity, add_intuition, 
                       add_endurance, add_intelligence, add_wisdom, 
                       add_accuracy, add_evasion, add_criticals, 
                       add_min_physical_damage, add_max_physical_damage, 
                       image, weight) 
                       VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)";
            $values = [
                $owner, $this->name, $this->item_type, $this->durability, $this->price,
                $this->need_strength, $this->need_dexterity, $this->need_intuition,
                $this->need_endurance, $this->need_intelligence, $this->need_wisdom,
                $this->add_strength, $this->add_dexterity, $this->add_intuition,
                $this->add_endurance, $this->add_intelligence, $this->add_wisdom,
                $this->add_accuracy, $this->add_evasion, $this->add_criticals,
                $this->add_min_physical_damage, $this->add_max_physical_damage,
                $this->image, $this->weight
                ];
            $db->execute($query, $values);
        }
    }

    /**
     * Для кнопок управления под картинкой предмета в зависимости от ситуации.
     */
    public function printControls($shopType = false)
    {
        if ($shopType === 'marketput') {
            echo <<<BTN
<form method="post">
<input placeholder="{$this->price}" name="cost">
<input type="hidden" name="putId" value="{$this->item_id}">
<br><input type="submit" name="putToMarket" value="Cдать в магазин">
</form>
BTN;
        } else {
            switch ($shopType) {
                default:
                    $btnValue = "Купить за " . intval($this->price) . " кр.";
                    $btnLink = "/shop.php?buy={$this->item_id}&rnd=" . mt_rand();
                    break;
                case 'sell':
                    $btnValue = "Продать";
                    $btnLink = "/shop.php?sell={$this->item_id}&rnd=" . mt_rand();
                    break;
                case 'marketgetback':
                    $btnValue = "Снять с продажи";
                    $btnLink = "?back={$this->item_id}&rnd=" . mt_rand();
                    break;
                case 'marketbuy':
                    $btnValue = "Купить за " . intval($this->setsale) . " кр.";
                    $btnLink = "?otdel={$this->item_type}&set={$this->item_id}&rnd=" . mt_rand();
                    break;
            }

            echo <<<BTN
<p><input type="button" style="background: darkgrey; border: 1px solid grey; border-radius: 2px;" value="{$btnValue}"
                                   onclick="location='{$btnLink}'">
BTN;
        }
    }
}