How to update the value of array in Yii session - php

Question

I am using "ajaxSubmitButton" to send some values of 3 fields: registrant, product id and quantity to controller (controller name: actionCart). After submitting the button I receive those values in session array what I did successfully. At this point, if I submit same product id but different quantity, I want to update the quantity key with new value. I have done this by php global $_SESSION but can't using Yii session variable.
public function actionCart()
{
if(isset($_POST["Order"])){
$item = $_POST["Order"];
$registration_id = $item["registration_id"];
$this->productId = $item["item"];
$quantity = $item["quantity"];
$quantity = $item["quantity"]=='' ? 1 : $item["quantity"];
$productInfo = Products::model()->findByPk(array('id'=>$this->productId));
$totalPrice = $productInfo->price * $quantity;
$newItem = array("product_id" => $this->productId , "product_name" => $productInfo->name, "quantity" => $quantity,"price" => $productInfo->price,"totalPrice" => $totalPrice);
$session = Yii::app()->session;
$cartArray = $session['cart'];
$searchArrResult = $this->searchSubArray($session['cart'],'product_id',$this->productId);
if (!empty($searchArrResult)) {
/***** this works *****/
foreach ( $_SESSION['cart'] as $key=>$cart ) {
if ( $cart["product_id"] == $this->productId ) {
$_SESSION['cart'][$key]['quantity']=$quantity;
$_SESSION['cart'][$key]['totalPrice']=$totalPrice;
}
}
/***** following commented code does not work *****
*
foreach($session['cart'] as $key=>$cart){
if ($cart["product_id"] == $this->productId){
$session['cart'][$key]['quantity'] == $quantity;
$session['cart'][$key]['totalPrice'] == $totalPrice;
}
}*/
}
else {
$cartArray[] = $newItem;
$session['cart'] = $cartArray;
}
print_r($session['cart']);
//unset(Yii::app()->session['cart']);
}
}
In the above code I marked by commenting where I want to update session values. Please help me someone if it is possible do in yii.

Answer 1

Try this:
$carts = $session['cart'];
foreach($carts as $key=>&$cart){
if ($cart["product_id"] == $this->productId){
$cart['quantity'] == $quantity;
$cart['totalPrice'] == $totalPrice;
}
}
$session['cart'] = $carts;
Yii::app()->session return object of CHttpSession, not reference to $_SESSION.
$carts = $session['cart'] equals operation $carts = $session->get('cart'); (by means magic method __get in CHttpSession) and $session['cart'] = $carts; equals to $session->set('cart', $carts); (by __set)
That's why you can't setting by $session['cart'][$key]['quantity'] = $quantity;
UPDATED full solution (I change logic of saving products - $key = product_id)
public function actionCart()
{
if(isset($_POST["Order"])){
$item = $_POST["Order"];
$registration_id = $item["registration_id"];
$this->productId = $item["item"];
$quantity = empty(intval($item["quantity"])) ? 1 : intval($item["quantity"]);
$productInfo = Products::model()->findByPk(array('id'=>$this->productId));.
if(empty($productInfo))
return false; // or other action
$newItem = array(
"product_id" => $this->productId ,
"product_name" => $productInfo->name,
"quantity" => $quantity,
"price" => $productInfo->price,
"totalPrice" => ($productInfo->price * $quantity)
);
$cartArray = Yii::app()->session['cart'];
$cartArray[$this->productId] = $newItem;
Yii::app()->session['cart'] = $cartArray;
}
}