add_action('wp_ajax_nopriv_submit_rsvp', 'submit_rsvp');
add_action('wp_ajax_submit_rsvp', 'submit_rsvp');

function submit_rsvp() {
    global $wpdb;

    $table = $wpdb->prefix . "rsvp_messages";

    $name = sanitize_text_field($_POST['name']);
    $attendance = intval($_POST['attendance']);
    $guests = intval($_POST['guests']);
    $message = sanitize_textarea_field($_POST['message']);
    $post_id = intval($_POST['post_id']);

    $insert = $wpdb->insert($table, [
        'post_id' => $post_id,
        'name' => $name,
        'attendance' => $attendance,
        'guests' => $guests,
        'message' => $message
    ]);

    if ($insert) {
        wp_send_json_success('ok');
    } else {
        wp_send_json_error('failed');
    }
}<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://undangan.azzamedia.id/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://undangan.azzamedia.id/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://undangan.azzamedia.id/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://undangan.azzamedia.id/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://undangan.azzamedia.id/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>