WooCommerce - Adding a custom price to each product in cart

Question

I would like to update the price of products adding a custom price in cart using this simple piece of code update_post_meta( $product->id, '_regular_price', $frame_price_added);.

Note: what I'm trying to achieve is to add this custom price to each product in cart.

I have try to get $frame_price_added this way:

$frame_price = $res['_number_field'][0];
$frame_price_added = $product->price + $frame_price;

Here $product->price is price coming from woocomerce product and $frame_price is coming from my newly added price.

I was wondering how do I associate this new price to cart, because it doesn't work.

I have tried using update_post_meta( $product->id, '_price', $frame_price_added); and when page is refreshed it adds and stores the custom price to the product, and saved it.

Any idea on how I can achieve this properly?

Thanks.

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Edit: One more thing… I have searched a function that can being called on add to cart and i didn't find any thing, and also an action hook being called on woocommerce_template_single_add_to_cart which had woocommerce_single_product_summary but it didn't find any function.

Answer 1

Updated (since WooCommerce 3+)

You can use woocommerce_before_calculate_totals hook to customize your cart items prices.

You can define $framed_price variables as global in your function, this way.

This is the code:

// getting your additional price outside the function (making any conditional calculations) 
$framed_price = 20;

add_action( 'woocommerce_before_calculate_totals', 'add_custom_total_price', 10 );
function add_custom_total_price( $cart ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    global $framed_price;

    foreach ( $cart->get_cart() as $item ) {
        $item['data']->set_price( $item['data']->get_price() + $framed_price );
    }
}

Or get your custom price inside the hooked function (optionally, depending on how you get your custom price):

add_action( 'woocommerce_before_calculate_totals', 'add_custom_total_price', 10 );
function add_custom_total_price( $cart ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $framed_price = 20;

    foreach ( $cart->get_cart() as $item ) {
        $item['data']->set_price( $item['data']->get_price() + $framed_price );
    }
}

The code is tested.

Naturally this code goes on functions.php file of your active child theme (or theme) or in any plugin file.

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Important note

You might need to use additionally woocommerce_cart_item_price like in this more recent thread, for Cart and Mini cart displayed item prices.

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Reference: WooCommerce Cart - Dynamic Price variable pass into custom price hook