WordPress plugin návštěvní kniha kód

<?php
/*
Plugin Name: Guestbook Widget
Plugin URI: https://www.example.com/
Description: Tento plugin umožňuje návštěvníkům zanechat vzkaz na vašem webu.
Version: 1.0
Author: Autor
Author URI: https://www.example.com/
*/

function guestbook_widget() {
    if ( isset( $_POST['submit_message'] ) ) {
        $name = sanitize_text_field( $_POST['guest_name'] );
        $message = sanitize_text_field( $_POST['guest_message'] );
        $time = current_time( 'mysql' );

        global $wpdb;
        $table_name = $wpdb->prefix . 'guestbook';
        $wpdb->insert( $table_name, array(
            'time' => $time,
            'name' => $name,
            'message' => $message,
        ) );
    }

    $form = '<form method="post">
                <label>Jméno:</label>
                <input type="text" name="guest_name">
                <label>Vzkaz:</label>
                <textarea name="guest_message"></textarea>
                <input type="submit" name="submit_message" value="Odeslat vzkaz">
            </form>';
    return $form;
}

add_shortcode('guestbook', 'guestbook_widget');

function create_guestbook_table() {
    global $wpdb;
    $table_name = $wpdb->prefix . 'guestbook';
    $charset_collate = $wpdb->get_charset_collate();

    $sql = "CREATE TABLE $table_name (
        id mediumint(9) NOT NULL AUTO_INCREMENT,
        time datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
        name tinytext NOT NULL,
        message text NOT NULL,
        PRIMARY KEY  (id)
    ) $charset_collate;";

    require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
    dbDelta( $sql );
}

register_activation_hook( __FILE__, 'create_guestbook_table' );