Add product category to WooCommerce Email Notifications

Question

I'm trying to add product category to the email notification. The custom fields (Time and Date) work but the product category is displaying as an "Array".

function render_product_description($item_id, $item, $order){
    $_product = $order->get_product_from_item( $item );
    echo "<br>" . $_product->post->post_content;
    echo "<br>";
    echo '<p><strong>Time:</strong><br />';
        echo get_post_meta($_product->id, 'time', true) .'</p>';

    echo '<p><strong>Category:</strong><br />';
        echo wp_get_post_terms($_product->id, 'product_cat', true) .'</p>';

    echo '<p><strong>Date:</strong><br />';
        echo get_post_meta($_product->id, 'date', true) .'</p>';
}

add_action('woocommerce_order_item_meta_end', 'render_product_description',10,3);

Answer 1

You can use implode() function that join array values in a string.

I also added an extra check for empty values

function render_product_description( $item_id, $item, $order, $plain_text ) {
    // Get product id
    $product_id = $item->get_product_id();

    // Get product
    $product = $item->get_product();

    // Product content
    $product_content = $product->post->post_content;

    // NOT empty
    if ( ! empty ( $product_content ) ) {
        echo '<p>' . $product_content . '</p>'; 
    }

    // Get post meta
    $time = get_post_meta( $product_id, 'time', true );

    // NOT empty
    if ( ! empty ( $time ) ) {
        echo '<p><strong>Date:</strong><br />' . $time . '</p>';    
    }

    // Get terms
    $term_names = wp_get_post_terms( $product_id, 'product_cat', ['fields' => 'names'] );

    // NOT empty
    if ( ! empty ( $term_names ) ) {
        echo '<p><strong>Categories:</strong><br />' . implode( ", ", $term_names ) . '</p>';   
    }

    // Get post meta
    $date = get_post_meta( $product_id, 'date', true );

    // NOT empty
    if ( ! empty ( $date ) ) {
        echo '<p><strong>Date:</strong><br />' . $date . '</p>';    
    }
}

add_action( 'woocommerce_order_item_meta_end', 'render_product_description', 10, 4 );