PHP - Moved: Really Random Question Doesn't Belong Anywhere

Hi, 

I'm trying to display the products for a certain tag in the email for new order in wooCommerce. For example, I want that when a client buys a product with a certain tag, all the products that have that tag to be added automatically to the order email too. 

For now I achieved to display the tag in the email but not the products that have that tag. I don't know how get the products that belongs to that tag and add them to the cart to so I can display them in the email.

Any help as small as it may be, it is very welcomed, please. I'm a bit stuck. I'm not very skilled in php...

Thank you very much

function email_products_per_tag( $order, $item ) {
    $items = $order->get_items();
    foreach ( $items as $item ) {
        $terms = wp_get_post_terms( $item['product_id'], 'product_tag' );
        foreach($terms as $term){
            $term_names[] = $term->name; // Product tag Name
           // $item2 = 'product_tag'=> ; // not very sure about this line...
        }
    }
}
    add_action( 'woocommerce_email_after_order_table', 'email_products_per_tag', 10, 4 );