Php 根据类别的数量折扣更改WooCommerce购物车商品价格

首先，您没有使用右钩子，您的代码可以简化，并且有遗漏的地方.

要根据特定产品类别的数量对购物车项目进行折扣，请try :

// Utility function: Get specific category discount based on quantity
function get_category_custom_discount( $cart, $category ) {
    $calculated_qty = 0; // Initializing

    foreach( $cart->get_cart() as $cart_item ) {
        if( has_term( $category, 'product_cat', $cart_item['product_id'] ) ) {
            $calculated_qty   += $cart_item["quantity"]; 
        }
    }

    if ( $calculated_qty >= 200 ) {
        return 1.5;
    } else if( $calculated_qty >= 100 ) {
        return 1;
    } else {
        return 0;
    }
}

// Change cart item price
add_action( 'woocommerce_before_calculate_totals', 'category_ferns_set_bulk_discount', 20, 1 );
function category_ferns_set_bulk_discount( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( did_action('woocommerce_before_calculate_totals') > 1 )
        return;


    $category = 'ferns';
    $discount = get_category_custom_discount( $cart, $category );

    if ( $discount > 0 ) {
        foreach($cart->get_cart() as $cart_item) {
            if( has_term($category, 'product_cat', $cart_item['product_id']) ) {
                $product = wc_get_product( $cart_item['variation_id'] > 0 ? $cart_item['variation_id'] : $cart_item['product_id'] );
                $cart_item['data']->set_price( $product->get_price() - $discount );
            }
        }
    }
}

// Handle mini cart displayed price
add_action( 'woocommerce_cart_item_price', 'category_ferns_display_bulk_discount', 20, 2 );
function category_ferns_display_bulk_discount( $price_html, $cart_item ) {
    $cart     = WC()->cart;
    $category = 'ferns';
    $discount = get_category_custom_discount( $cart, $category );

    if( $discount > 0 && has_term($category, 'product_cat', $cart_item['product_id']) ) {
        $product = wc_get_product( $cart_item['variation_id'] > 0 ? $cart_item['variation_id'] : $cart_item['product_id'] );
        $args = array( 'price' => floatval( $product->get_price() - $discount ) ); 

        if ( $cart->display_prices_including_tax() ) {
            $product_price = wc_get_price_including_tax( $product, $args );
        } else {
            $product_price = wc_get_price_excluding_tax( $product, $args );
        }
        return wc_price( $product_price );
    }
    return $price_html;
}

代码位于您的子主题的unctions.php文件中(或在插件中).应该能行得通.