问每个产品的WooCommerce极限变化

EN

add_filter( 'woocommerce_add_to_cart_validation', 'allowed_products_variation_in_the_cart', 10, 5 );
function allowed_products_variation_in_the_cart( $passed, $product_id, $quantity, $variation_id, $variations) {
    foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item) {
        if($cart_item['product_id'] == $product_id)
        {   
            wc_add_notice(__('You can\'t add this product.', 'domain'), 'error');
            $passed = false; // don't add the new product to the cart
            // We stop the loop
            break;
        }
        
    }

    return $passed;
}

add_filter( 'woocommerce_add_to_cart_validation', 'woocommerce_custom_add_to_cart_validation', 10, 5 );
function woocommerce_custom_add_to_cart_validation ($passed, $product_id, $quantity, $variation_id, $variations) {
    $variation_id_to_delete = null;
    $is_current_variation = false;
    foreach ( WC()->cart->get_cart() as $item_key => $item ) {
        $product = $item['data'];
        $attributes = $product->get_attributes();
        if($variations['attribute_varient-id'] == $product->get_attribute('varient-id')) { // IMPORTANT = ATTRIBUTE NAMES SHOULD MATCH WITH WC ATTRIBUTES
            $variation_id_to_delete = $item_key;
            $is_current_variation = true;
            break;
        }
    }
    // IF IS_CURRENT_VARIATION_ID : DELETE
    if ($is_current_variation){
        WC()->cart->remove_cart_item($variation_id_to_delete);
    }
    return $passed; 
}