php - 限制 woocommerce 购物篮大小

Question

下面有一个片段，将 woocommerce 订单限制为 5 件。当他们尝试结帐超过 5 件商品时，系统会弹出一条消息，告诉他们，然后他们必须删除商品。我想知道是否有办法让他们不能向购物篮添加超过 5 件商品？

add_action( 'woocommerce_check_cart_items', 'set_max_num_products' );
function set_max_num_products() {
// Only run in the Cart or Checkout pages
if( is_cart() || is_checkout() ) {
    global $woocommerce;

    // Set the max number of products before checking out
    $max_num_products = 5;
    // Get the Cart's total number of products
    $cart_num_products = WC()->cart->cart_contents_count;

    // A max of 5 products is required before checking out.
    if( $cart_num_products > $max_num_products ) {
        // Display our error message
        wc_add_notice( sprintf( '<strong>A maxiumum of %s samples are allowed per order. Your cart currently contains %s.</strong>',
            $max_num_products,
            $cart_num_products ),
        'error' );
    }
}
}

Answer 1

每个产品都必须经过验证才能添加到购物车。您可以通过 woocommerce_add_to_cart_validation 过滤器修改验证状态，从而控制是否将其添加到购物车。

function so_33134668_product_validation( $valid, $product_id, $quantity ){
    // Set the max number of products before checking out
    $max_num_products = 5;
    // Get the Cart's total number of products
    $cart_num_products = WC()->cart->cart_contents_count;

    $future_quantity_in_cart = $cart_num_products + $quantity;

    // More than 5 products in the cart is not allowed
    if( $future_quantity_in_cart > $max_num_products ) {
        // Display our error message
        wc_add_notice( sprintf( '<strong>A maxiumum of %s samples are allowed per order. Your cart currently contains %s.</strong>',
            $max_num_products,
            $cart_num_products ),
        'error' );
        $valid = false; // don't add the new product to the cart
    }
    return $valid;
}
add_filter( 'woocommerce_add_to_cart_validation', 'so_33134668_product_validation', 10, 3 );