[site-reviews] [site_reviews_rating] shortcode

/**
 * Registers the [site_reviews_rating] shortcode
 * This shortcode displays the average star rating of a page or category that has reviews assigned to them.
 *
 * Shortcode options are as follows:
 * - [site_reviews_rating category=""] Optional. Allowed values: category slug or ID
 * - [site_reviews_rating assigned_to=""] Optional. Allowed values: post/page ID or "post_id" to use the current page ID
 *
 * Note: the "assigned_to" option will take precedence over the "category" option, you should only use one or the other.
 *
 * Paste this in your active theme's functions.php file
 * @param array $atts
 * @return int
 */
add_shortcode('site_reviews_rating', function ($atts) {
    $atts = wp_parse_args($atts, [
        'assigned_to' => '',
        'category' => '',
    ]);
    $rating = 0;
    if (!empty($atts['category'])) {
        if ($term = term_exists($atts['category'], 'site-review-category')) {
            $rating = get_term_meta($term['term_id'], '_glsr_average', true);
        }
    }
    if (!empty($atts['assigned_to'])) {
        $postId = $atts['assigned_to'] == 'post_id'
            ? get_the_ID()
            : $atts['assigned_to'];
        $rating = get_post_meta($postId, $metaKey, true);
    }
    return apply_filters('glsr_star_rating', $rating, $rating);
});