Magento add products to cart via products IDS

Magento-products-to-cart.php

<?php

public function addToAction()
{
    $cart = Mage::getSingleton('checkout/cart');

    $cart->addProductsByIds(
        array(
            $this->getRequest()->getParam('currentproduct'),
            $this->getRequest()->getParam('relatedproduct')
        )
    );

    $cart->save();
    Mage::getSingleton('checkout/session')->setCartWasUpdated(true);

    $this->_redirect('checkout/cart');
}