[site-reviews] shortcode [site_review]

/**
 * Registers the [site_review] shortcode
 * This shortcode displays a single review
 *
 * Shortcode options are as follows:
 * - [site_reviews form=""] Optional. Allowed values: the Post ID of a custom review form
 * - [site_reviews hide=""] Optional. Allowed values are same as in the [site_reviews] shortcode.
 * - [site_reviews post_id=""] Optional. Allowed values: the Post ID of a review
 * - [site_reviews theme=""] Optional. Allowed values: the Post ID of a custom review theme
 *
 * Paste this in your active theme's functions.php file
 * @param array $atts
 * @return string|void
 */
add_shortcode('site_review', function ($atts) {
    $atts = wp_parse_args($atts, [
        'form' => '',
        'hide' => '',
        'post_id' => '',
        'theme' => '',
    ]);
    if (!empty($atts['post_id'])) {
        $reviews = apply_filters('glsr_get_reviews', null, [
            'per_page' => 1,
            'post__in' => (array) $atts['post_id'],
        ]);
    }
    if (!empty($reviews)) {
        $reviews->args['form'] = $atts['form'];
        $reviews->args['hide'] = array_map('trim', explode(',', $atts['hide']));
        $reviews->args['theme'] = $atts['theme'];
        $html = $reviews->build();
        return sprintf('<div class="%s">%s</div>', $html->style, $html);
    }
});