How can I add a Magento product to current cart programmatically
You need to use checkout/cart and catalog/product models to add Magento product to the current cart
$cart = Mage::getSingleton('checkout/cart');
$cart->init();
$options = array('1'=>'3','2'=>'6'); // product options
$product = Mage::getModel('catalog/product')->load(2); // product id - 2
$paramater = array('product' => '2', // product id - 2
'qty' => '1',
'form_key' => Mage::getSingleton('core/session')->getFormKey(),
'options' => $options
);
$request = new Varien_Object();
$request->setData($paramater);
$cart->addProduct($product, $request);
$cart->save();