Event Tickets Plus > Adds different custom message to order emails depending on order items

functions.php

<?php
/**
 * Adds different custom message to order emails depending on order items
 * @author Victor Zarranz
 */

add_action( 'woocommerce_email_order_details', 'add_custom_message', 10, 1 );
function add_custom_message( $order ) {
	$wootix = Tribe__Tickets_Plus__Commerce__WooCommerce__Main::get_instance();
	$items = $order->get_items();

	$has_ticket = false;
	$has_product = false;

	foreach ( $items as $item ) {
		$event = '';
		$item_data = $item->get_data();
		$event = $wootix->get_event_for_ticket( $item_data['product_id'] );
	
		if ( ! empty( $event ) ) {
			$has_ticket = true;
		} else {
			$has_product = true;
		}
	}

	if ( $has_product && $has_ticket ) {
		// has both products and tickets in the order
		printf(
				'<p>%1$s</p>',
				'Thank you for signing up for an event. See shipping details for your products below.'
			);
	} elseif ( $has_ticket ) {
		// only has ticket/s in the order
		printf(
				'<p>%1$s</p>',
				'Thank you for signing up for an event.'
			);
	} else {
		// only has products
		printf(
				'<p>%1$s</p>',
				'Thank you for your purchase. See shipping details for your products below.'
			);
	}
}