Woocommerce如何限制购物车页面上每个类别的数量

Question

我发现此代码有效，但仅用于产品页面，而不检查购物车页面中的数量。

add_filter( 'woocommerce_add_to_cart_validation', 'only_four_items_allowed_add_to_cart', 10, 3 );

function only_four_items_allowed_add_to_cart( $passed, $product_id, $quantity ) {

$cart_items_count = WC()->cart->get_cart_contents_count();
$total_count = $cart_items_count + $quantity;

if(has_term('quantity4','product_cat',$product_id )){
if($cart_items_count >= 4 || $total_count > 4){
        // Set to false
        $passed = false;
        // Display a message
        wc_add_notice( __( "You Chose a Box of 4 Items, Can't Add More", "woocommerce" ), "error" );
    }
  }

  else if (has_term('quantity6','product_cat',$product_id )){
    if($cart_items_count >= 6 || $total_count > 6){
        // Set to false
        $passed = false;
        // Display a message
        wc_add_notice( __( "You Chose a Box of 6 Items, Can't Add More", "woocommerce" ), "error" );
    }
}

return $passed;
}

有人可以帮我检查一下我需要在此代码中添加的内容吗，也可以在购物车页面中查看吗？任何帮助将不胜感激。