[site-reviews] set rating number dynamically from custom rating fields

/**
 * Dynamically set the rating to the average of your custom rating fields.
 * !IMPORTANT: make sure to remove the default rating field in your custom form for this to work.
 * Paste this in your active theme's functions.php file.
 * @param array $values
 * @return array
 */
add_filter('site-reviews/create/review-values', function ($values, $request) {
    if (!empty($values['rating'])) {
        return $values; // don't set the overall rating if it already has a value
    }
    $fields = (array) get_post_meta($request->request->form, '_fields', true);
    $ratings = [];
    foreach ($fields as $field) {
        if ('rating' === glsr_get($field, 'type')) {
            $ratings[] = glsr_get($values, 'custom.'.glsr_get($field, 'name'), 0);
        }
    }
    $ratings = array_filter($ratings); // remove empty custom rating values;
    if (empty($ratings)) {
        return $value; // don't set the overall rating if there are no custom rating fields
    }
    $ratingsCount = count($ratings);
    $ratingsSum = array_sum($ratings);
    $values['rating'] = round($ratingsSum / $ratingsCount);
    return $values;
}, 10, 2);