How do I get items categories from the WooCommerce cart?

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I am writing the function which should check up whether there is in the cart an item, which has a particular category.

My idea was:

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add_filter( 'woocommerce_package_rates', 'remove_flat_rate_from_used_products', 10, 2 );

function remove_flat_rate_from_used_products($rates, $package) {
    if( is_woocommerce() && ( is_checkout() || is_cart() ) ) {
        if( check_whether_item_has_the_category() ) {
            unset( $rates['flat_rate'] );
        }
    }

    return $rates;
}

I guessed, the get_cart() function returns the contents of the cart, and I would be able to get information about items categories out there. I need to know the structure of the array get_cart() returns, so I wrote: 

function check_whether_item_has_the_category() {
    global $woocommerce;

    var_dump(WC()->cart->get_cart());
}

And got 

Warning: Invalid argument supplied for foreach() in ...wp-contentpluginswoocommerceincludesclass-wc-shipping.php on line 295

Then I tried find the category name in results of the get_cart() function: 

function check_whether_item_has_the_category() {
    global $woocommerce;

    if( in_array('used', WC()->cart->get_cart()) ) {
        echo 'do something';
    }
}

And got the same error.

The use of $woocommerce instead of WC() give nothing, as well as the remove of global $woocommerce

What am I doing wrong and how do I get items categories (or check them for existing of the particular one)?

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1 comment

  1. The variable $package contains also the cart contents ($package['contents']), that is an array with all the products in cart.

    So you can loop through that and see if the single product has the category wanted. To get the categories you can use wp_get_post_terms():

    function remove_flat_rate_from_used_products($rates, $package) {

    // for each product in cart...
    foreach ($package['contents'] as $product) {
        // get product categories
        $product_cats = wp_get_post_terms( $product['product_id'], 'product_cat', array('fields' => 'names') );
        // if it has category_name unset flat rate
        if( in_array('category_name', $product_cats) ) {
            unset( $rates['flat_rate'] );
            break;
        }
    }

    return $rates;
}

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