woocommerce change price while add to cart

Question

i have a one product 1€ and use e GET parameter to change the price at runtime:

http://url/warenkorb/?add-to-cart=1539&price=18.45

This change not the price

Answer 1

First of all I want to warn you that if you use price in the url of your add_to_cart link that might make your store vulnerable. If you use this in product meta that would be more secured. Anyway I'm showing you the code to achieve how to set price from the url.

add_filter( 'woocommerce_add_cart_item', 'c_other_options_add_cart_item', 20, 1 );
function c_other_options_add_cart_item( $cart_item ) {

    if (isset($cart_item['_other_options'])) :
        if( isset($cart_item['_other_options']['product-price']) )
            $extra_cost = floatval($cart_item['_other_options']['product-price']);

        $cart_item['data']->adjust_price( $extra_cost );
        // here the real adjustment is going on...

    endif;

    return $cart_item;

}

add_filter( 'woocommerce_add_cart_item_data', 'c_other_options_add_cart_item_data', 10, 2 );
function c_other_options_add_cart_item_data($cart_item_meta, $product_id){
    global $woocommerce;

    $product = new WC_Product( $product_id);
    $price = $product->price;

    if(empty($cart_item_meta['_other_options']))
        $cart_item_meta['_other_options'] = array();

    $cart_item_meta['_other_options']['product-price'] = esc_attr($_REQUEST['price']) - $price;

// as woocommerce allows to adjust the price (i don't know if there is any way to reset it, but this procedure works), we need to return the adjustable price 

    return $cart_item_meta;
}