woocommerce - programmatically update cart item quantity

Question

I am trying to programmatically update the quantity of a specific product in the cart if certain criteria is met. I can easily update the price of the cart items with the following: ``` add_action( 'woocommerce_before_calculate_totals', 'wwpa_simple_add_cart_price' ); function wwpa_simple_add_cart_price( $cart_object ) { foreach ( $cart_object->cart_contents as $key => $value ) { $value['data']->price = '1'; }} ``` In the function above I tried to add: ``` $value['data']->quantity= '10'; ``` This doesn't work but not quite sure how or if I can edit the quantity? I also tried a these combinations that I found while digging around WooCommerce: ``` $value['data']->quantity= '10'; $value['data']->qty= '10'; $value['quantity'] = '10'; ``` Again none of these worked.

Accepted Answer

There has been some changes to the WC_Cart class since this post originally got posted, so i updated it with the new changes.

To update the quantity:

```
WC()->cart->set_quantity($cart_item_key, 100);
```

How to get the $cart_item_key example:

```
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
    echo $cart_item_key;
} 
```

And another example with a known cart_item_key:

```
WC()->cart->set_quantity('8d317bdcf4aafcfc22149d77babee96d', 100);
```

Hope this helps:)

woocommerce - programmatically update cart item quantity

Solution

Problem