数量选择器/输入适用于WooCommerce迷你购物车

在WooCommerce迷你购物车中添加数量选择器/输入框的解决方法如下所示：

1. 首先，在主题的functions.php文件中添加以下代码来启用WooCommerce的小部件：

add_action( 'after_setup_theme', 'woocommerce_support' );
function woocommerce_support() {
    add_theme_support( 'woocommerce' );
}

2. 在主题的functions.php文件中添加以下代码来覆盖WooCommerce的迷你购物车模板：

function my_wc_mini_cart() {
    if ( ! defined( 'ABSPATH' ) ) {
        exit;
    }

    do_action( 'woocommerce_before_mini_cart' ); ?>

    <ul class="woocommerce-mini-cart cart_list product_list_widget <?php echo esc_attr( $args['list_class'] ); ?>">
        <?php if ( ! WC()->cart->is_empty() ) : ?>
            <?php
            do_action( 'woocommerce_before_mini_cart_contents' );

            foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
                $_product     = apply_filters( 'woocommerce_cart_item_product', $cart_item['data'], $cart_item, $cart_item_key );
                $product_id   = apply_filters( 'woocommerce_cart_item_product_id', $cart_item['product_id'], $cart_item, $cart_item_key );
                $product_permalink = apply_filters( 'woocommerce_cart_item_permalink', $_product->is_visible() ? $_product->get_permalink( $cart_item ) : '', $cart_item, $cart_item_key );

                ?>
                <li class="<?php echo esc_attr( apply_filters( 'woocommerce_mini_cart_item_class', 'mini_cart_item', $cart_item, $cart_item_key ) ); ?>">
                    <?php
                    echo apply_filters( 'woocommerce_cart_item_remove_link', sprintf(
                        '<a href="%s" class="remove" aria-label="%s" data-product_id="%s" data-cart_item_key="%s" data-product_sku="%s">&times;</a>',
                        esc_url( wc_get_cart_remove_url( $cart_item_key ) ),
                        __( 'Remove this item', 'woocommerce' ),
                        esc_attr( $product_id ),
                        esc_attr( $cart_item_key ),
                        esc_attr( $_product->get_sku() )
                    ), $cart_item_key ); ?>
                    <div class="cart_item_thumbnail">
                        <?php
                        $thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );

                        if ( ! $product_permalink ) {
                            echo $thumbnail;
                        } else {
                            printf( '<a href="%s">%s</a>', esc_url( $product_permalink ), $thumbnail );
                        }
                        ?>
                    </div>
                    <div class="cart_item_details">
                        <div class="product-title">
                            <?php if ( ! $product_permalink ) : ?>
                                <?php echo apply_filters( 'woocommerce_cart_item_name', $_product->get_name(), $cart_item, $cart_item_key ) . '&nbsp;'; ?>
                            <?php else : ?>
                                <a href="<?php echo esc_url( $product_permalink ); ?>">
                                    <?php echo apply_filters( 'woocommerce_cart_item_name', $_product->get_name(), $cart_item, $cart_item_key ); ?>
                                </a>
                            <?php endif; ?>
                        </div>
                        <div class="quantity">
                            <?php
                            if ( $_product->is_sold_individually() ) {
                                $product_quantity = sprintf( '1 <input type="hidden" name="cart[%s][qty]" value="1" />', $cart_item_key );
                            } else {
                                $product_quantity = woocommerce_quantity_input( array(
                                    'input_name'  => "cart[{$cart_item_key}][qty]",
                                    'input_value' => $cart_item['quantity'],
                                    'max_value'   => $_product->get_max_purchase_quantity(),
                                    'min_value'   => '0',
                                ), $_product, false );
                            }

                            echo apply_filters( 'woocommerce_cart_item_quantity', $product_quantity, $cart_item_key, $cart_item );
                            ?>
                        </div>
                        <div class="product-price">
                            <?php echo apply_filters( 'woocommerce_cart_item_price', WC()->cart->get_product_price( $_product ), $cart_item, $cart_item_key ); ?>
                        </div>
                    </div>
                </li>
                <?php
            }

            do_action( 'woocommerce_mini_cart_contents' );
            ?>
        <?php else : ?>
            <li class="empty"><?php esc_html_e( 'No products in the cart.', 'woocommerce' ); ?></li>
        <?php endif; ?>