Woocommerce: custom price based on user input

Question

I did not want to post here but I could not find the answer I was looking for and I do not have enough reputation to comment on other VERY SIMILAR questions to get my exact answ

Answer 1

I found a solution which is not elegant but works for my purposes.

I was trying to use cookies before but I didn't set the cookie path so it was only available to the page it was set on.

I am now setting a cookie with the donation price:

setcookie("donation", $_GET['donation'], 0, "/");

Then I am setting the price like so:

add_action( 'woocommerce_before_calculate_totals', 'woo_add_donation');

function woo_add_donation() {
    global $woocommerce;

    foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
        if($cart_item['data']->id == 358 && ! empty($_COOKIE['donation'])){
            $cart_item['data']->set_price($_COOKIE['donation']);
        }
    }
}