empty cart before add

Hi, I need to empty cart before add_to_cart,
If I add “WC_Cart::empty_cart()” to function add_to_cart in includes/class-wc-cart.php it works.

But if I add the following code in functions.php

add_filter( ‘woocommerce_add_to_cart_validation’, ‘woo_custom_add_to_cart_before’ );
function woo_custom_add_to_cart_before( $cart_item_data ) {
global $woocommerce;
WC_Cart::empty_cart();
// Do nothing with the data and return
return true;
}

I get an error in page:
jquery.js?ver=1.12.4:4 POST http://www.xxxxxxxx.com/?wc-ajax=add_to_cart 500 (Internal Server Error)

I do not want to change core source. How to solve it?

• This topic was modified 7 years, 11 months ago by amila.