Change cart item prices based on specific product attribute value in Woocommerce

Question

I am trying to change product price in cart using the following function:

add_action( 'woocommerce_before_calculate_totals', 'add_custom_price', 10);
function add_custom_price( $cart_obj ) {
    foreach ( $cart_obj->get_cart() as $key => $value ) {
        $item_data = $value['data'];
        $price0 = $item_data->get_attributes('per_one_price');
        $price  = (int) $price0;
        $value['data']->set_price( $num_int );
    }
}

But for any number I set as product attribute value for per_one_price attribute I get the number 1 in cart price.

Answer 1

Update - There is 2 little mistakes:

• Replace get_attributes() by get_attribute() (singular).
• Replace 'per_one_price' by 'Per one price' (or 'per-one-price' as blank spaces are replaced by dashes)

So instead try the following:

add_action( 'woocommerce_before_calculate_totals', 'set_custom_item_price', 20, 1 );
function set_custom_item_price( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
        return;

    // Loop through cart items
    foreach ( $cart->get_cart() as $cart_item ) {
        // get attibute value
        $new_price = $cart_item['data']->get_attribute('per-one-price');

        if( ! empty( $new_price ) ){
            // Set the new price
            $cart_item['data']->set_price( $new_price );
        }
    }
}

Code goes in function.php file of your active child theme (or active theme). tested and works.

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Create "Per one price" product attribute:

The product price setting view:

The product attribute set in the product with its value:

The cart page view with this product: