Email a list of favorites using Gravity Forms

favorites-gravityform-notification.php

/**
* Allow a user to email a list of favorites
* Place in functions.php and update to suit your specific form and needs
* @link https://www.gravityhelp.com/documentation/article/gform_notification/
*/
add_filter( 'gform_notification_1', 'email_favorites_list', 10, 3 );
function email_favorites_list($notification, $form, $entry)
{
	// Get the user's favorites and create a list
	$favorites = get_user_favorites();
	if ( !$favorites ) return $notification;

	$fq = new WP_Query(array(
		'post_type' => 'post',
		'posts_per_page' => -1,
		'post__in' => $favorites
	));
	if ( $fq->have_posts() ) :
		// Styles should be set inline for display in email clients
		$list = '<ul style="list-style-type:none;">';
		while ( $fq->have_posts() ) : $fq->the_post();
			$list .= '<li>';
			if ( has_post_thumbnail() ) $list .= get_the_post_thumbnail(get_the_id());
			$list .= '<h3>' . get_the_title() . '</h3>';
			$list .= '<p>' . get_the_excerpt() . '</p>';
			$list .= '</li>';
		endwhile;
		$list .= '</ul>';
	else :
		return $notification;
	endif; wp_reset_postdata();

	// Append the list to the notification message
	$notification['message'] = $list;

	// Change the to address to the user-specified email (this will change depending on your form)
	$notification['to'] = $entry[1]; // Email Field
	$notification['subject'] = __('A Favorites List from', 'textdomain') . ' ' . $entry[2]; // Name Field

	return $notification;
}

Has anyone tested this with or adapted it to work with Contact Form 7 and could share the effort?