如何设置WooCommerce购物车数量折扣并在迷你购物车中显示

Hey there, let's tackle your two WooCommerce questions one by one—both are totally doable with some custom code, and I've tested these snippets on WooCommerce 2.6.x and 3.0+ versions so they should work smoothly.

1. Set Up Cart Discount Based on Total Item Quantity #

This snippet adds a tiered discount based on how many total items are in the cart. You can tweak the quantity thresholds and discount percentages to match your store's needs:

add_action( 'woocommerce_cart_calculate_fees','wc_cart_quantity_discount', 10, 1 );
function wc_cart_quantity_discount( $cart_object ) {
    // Exit if we're in the admin dashboard (and not running an AJAX request)
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;

    // Define your discount tiers here: [minimum quantity] => [discount percentage]
    $discount_tiers = array(
        5  => 10,  // 10% off when 5+ items are in the cart
        10 => 20,  // 20% off when 10+ items are in the cart
        15 => 30   // 30% off when 15+ items are in the cart
    );

    $cart_item_count = $cart_object->get_cart_contents_count();
    $discount = 0;
    $applied_percent = 0;

    // Loop through tiers to find the highest applicable discount
    foreach ( $discount_tiers as $quantity => $percent ) {
        if ( $cart_item_count >= $quantity ) {
            $discount = $cart_object->subtotal * ( $percent / 100 );
            $applied_percent = $percent;
        }
    }

    // Apply the discount if it's valid
    if ( $discount > 0 ) {
        $cart_object->add_fee( sprintf( __( 'Quantity Discount (%d%%)', 'woocommerce' ), $applied_percent ), -$discount );
    }
}

Quick Usage Tips: #

• Drop this code into your child theme's functions.php file, or use a custom code snippets plugin (avoid editing the parent theme directly—you'll lose changes on updates!).
• Adjust the $discount_tiers array to fit your store. For example, 3 => 5 would mean 5% off when a customer adds 3 or more items to their cart.

2. Display the Quantity Discount in the Mini Cart #

To show the discount in your mini cart, you'll need to edit your theme's mini-cart template. First, copy the template file from woocommerce/templates/cart/mini-cart.php to your child theme's woocommerce/cart/ directory—this way, your changes won't get overwritten when your theme updates.

Find the section where cart totals are displayed (usually near the line with wc_cart_totals_subtotal_html()), then add this code to render the discount:

<?php
// Check for and display the quantity discount in the mini cart
foreach ( WC()->cart->get_fees() as $fee ) {
    if ( strpos( $fee->name, 'Quantity Discount' ) !== false ) {
        ?>
        <tr class="cart-discount quantity-discount">
            <th><?php echo esc_html( $fee->name ); ?></th>
            <td><?php wc_cart_totals_fee_html( $fee ); ?></td>
        </tr>
        <?php
    }
}
?>

This will scan all fees applied to the cart, find the quantity discount, and display it right alongside other totals like subtotal and shipping.

内容的提问来源于stack exchange，提问作者Dom