显示自定义消息当购物车中有2个特定产品类别时

Question

In Woocommerce, I'm trying to make a function that displays a message above the cart page when products with both categories are in the cart.

I'm trying to modify code that I found here but now it already shows the message when one of the categories is added instead of both:

add_action( 'woocommerce_before_cart', 'allclean_add_checkout_content', 12 );
function allclean_add_checkout_content() {

    $special_cat2 = 'test-cat2';
    $special_cat3 = 'test-cat3';
    $bool = false;

    foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
        $item = $cart_item['data'];
        if ( has_term( $special_cat2 && $special_cat3, 'product_cat', $item->id ) )
            $bool = true;
    }

    if ($bool)
        echo '<div class="cartmessage">Warning! Beware of combining these materials!</div>';
}

Answer 1

There is some mistakes in your code like has_term() does not support 2 terms separated with && and to get the product id from cart for custom taxonomy as product categories you need $cart_item['product_id'] instead that will also work with product variations……

To make that works when both product categories are in cart use this instead:

add_action( 'woocommerce_before_cart', 'allclean_add_checkout_content', 12 );
function allclean_add_checkout_content() {

    $product_cats = array('test-cat2','test-cat3'); 
    $found1 = $found2 = false;

    foreach ( WC()->cart->get_cart() as $cart_item ) {
        // The needed working product ID is $cart_item['product_id']  <====
        if ( has_term( $product_cats[0], 'product_cat', $cart_item['product_id'] ) )
            $found1 = true;
        elseif ( has_term( $product_cats[1], 'product_cat', $cart_item['product_id'] ) )
            $found2 = true;
    }

    if ( $found1 && $found2 )
        echo '<div class="cartmessage">Warning! Beware of combining these materials!</div>';
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.