This is a guest class for guestbook, still on development

guest.php

<?php
/**
 * This class extend database class
 * It contains all method for managing 
 * The guest activities.
 *
 * @author Akyoo
 */

require_once 'database.php';

    class guest extends database{
        
        public $title;
        public $first_name;
        public $middle_name;
        public $last_name;
        public $date;
        public $email;
        public $address;
        
        public function __construct($title, $first_name, $middle_name = "", $last_name, $email, $address = ""){
            $this -> title = $title;
            $this -> first_name = $first_name;
            $this -> middle_name = $middle_name;
            $this -> last_name = $last_name;
            $this -> email  = $email;
            $this -> address = $address;
        }
        
        public function set_title($title){
            if(strlen($title) > 1){
                $this -> title = $title;
            }  else {
                throw new Exception("Title too short");
            }
        }

        public function set_first_name($first_name){
            $this -> first_name = $first_name;
        }
        
        public function set_middle_name($middle_name) {
            $this -> middle_name = $middle_name;
        }
        
        public function set_last_name($last_name){
            $this -> last_name = $last_name;
        }
        
        public function set_email($email){
            $this -> email = $email;
        }

        public function set_address($address){
            $this -> address = $address;
        }
        
        public function get_title(){
            return $this -> title;
        }

        public function get_first_name(){
            return $this -> first_name;
        }
        
        public function get_middle_name(){
            return $this -> middle_name;
        }
        
        public function get_last_name(){
            return $this -> last_name;
        }
        
        public function get_email(){
            return $this -> email;
        }
        
        public function get_address(){
            return $this -> address;
        }

        public function create(){
            //create guest instructions
        }
        
        public function delete($guest_id){
            // delete guest here.
        }
        
        public function update($guest_id){
            // update guest instructions here.
        }
        
        public function find_guest_by_id($guest_id){
            // instruction to find a guest by id.
        }
        
        public function find_all_guests(){
            // instructions to get all guests here.
        }
            
        
    }

?>