我如何将对PHP过滤器的响应仅限为一个

Question

我在php中为WordPress创建了一个过滤器，该过滤器在购物车中时会显示一条特殊消息。特别的消息多次显示，因为该类别的许多产品都在购物车中。如何将输出仅限为一个？这是代码：

 add_action( 'woocommerce_after_checkout_form', 'allclean_add_checkout_content', 12 );
function allclean_add_checkout_content() {
    // set your special category name, slug or ID here:
    $shippingclass =  array( 'cut' );
    $bool = false;
    foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
	$shipping_class = get_the_terms( $values['variation_id'], 'product_shipping_class' );
        if ( isset( $shipping_class[0]->slug ) && in_array( $shipping_class[0]->slug, $shippingclass ) ) {
            $bool = true;
    }
    // If the special cat is detected in one items of the cart
    // It displays the message
    if ($bool)
        echo '<div class="example1"><h3>Items in your cart can be cut to save on shipping. List which items you want cut in your order notes.</h3></div>';
}
}

Answer 1

您在foreach循环中回声。只需将其移到外面。另外，在找到第一个实例之后，无需继续循环，因此将$bool设置为true

后用break将其分解

add_action('woocommerce_after_checkout_form', 'allclean_add_checkout_content', 12);
function allclean_add_checkout_content()
{
    // set your special category name, slug or ID here:
    $shippingclass = array('cut');
    $bool = false;
    foreach (WC()->cart->get_cart() as $cart_item_key => $values)
    {
        $shipping_class = get_the_terms($values['variation_id'], 'product_shipping_class');
        if (isset($shipping_class[0]->slug) && in_array($shipping_class[0]->slug, $shippingclass))
        {
            $bool = true;
            break;
        }
    }
    // If the special cat is detected in one items of the cart
    // It displays the message
    if ($bool)
    {
        echo '<div class="example1"><h3>Items in your cart can be cut to save on shipping. List which items you want cut in your order notes.</h3></div>';
    }
}