lessonOOP.php

<?php
header("Content-Type: text/html; charset=utf-8");
include_once("Db.php");
class GuestBook{
    private $firstName;
    private $email;
    private $message;
    function __construct($db,$firstName,$email,$message){
        $this->db = $db;
        $this->firstName = $firstName;
        $this->email     = $email;
        $this->message   = $message;

    }
    function  getText(){
           return " <b><em>Имя автора</b></em>: " . $this->firstName .
                  " <br><b><em>Почта: </b></em> " . " $this->email " .
                  " <br><b><em>Сообщение:</b></em> ". $this->message;
    }
    function save(){
        return $this->db->query(" INSERT INTO guest_book (firstName,email,message)
                              VALUES(' {$this->firstName} ' , ' {$this->email} ' , ' {$this->message} ' )");
    }

}
$object = new GuestBook($db,'Ололошка','[email protected]','HELL');