[site-reviews] send email after responding to a review

/**
* Send an email notification to the review author after responding to a review
* Paste this code in your theme’s functions.php file.
* @param \GeminiLabs\SiteReviews\Review $review
* @param string $response
* @return void
*/
add_action('site-reviews/review/responded', function ($review, $response) {
    $hasResponse = !empty($review->response);
    $hasResponseUserId = !empty(get_post_meta($review->ID, '_response_by', true));
    if (empty($response) || $hasResponse || $hasResponseUserId) {
        return; // only send an email if the response is not empty and there is no previous response
    }
    if (empty($review->email)) {
        return; // this review has not been submitted with an email
    }
    if (empty($review->assigned_posts)) {
        return; // this review has not been assigned to any Post
    }
    $postId = $review->assigned_posts[0]; // Get the first assigned Post ID
    $permalink = get_permalink($postId); // Get the permalink of the assigned Post
    $subject = sprintf('[%s], We have responded to your review!', get_bloginfo('name'));
    $message = sprintf('Just letting you know that we have <a href="%s">responded to your review</a>!', $permalink);
    $email = glsr('Modules\Email')->compose([
        'to' => $review->email,
        'subject' => $subject,
        'message' => $message,
    ]);
    $email->send();
}, 10, 2);