session.php

<?php


class Session{

    private $signed_in = false;
    public  $user_id;
    public  $message;


    function __construct(){
        session_start();
        $this->check_the_login();
        $this->check_message();

    }

public function message($msg=""){

    if(!empty($msg)){

        $_SESSION['message'] = $msg;


    }else{

        return $this->message;

    }

}


private function check_message(){

    if(isset($_SESSION['message'])) {

        $this->message = $_SESSION['message'];
        unset($_SESSION['message']);


    }else{

        $this->message = "";

    }
}




    //call a getter function
    public function is_signed_in(){

        return $this->signed_in;

    }


    public function login($user) {

        if($user) {

            $this->user_id = $_SESSION['user_id'] = $user->id;
            $this->signed_in = true;

        }


    }

    public function logout(){

        unset($_SESSION['user_id']);
        unset($this->user_id);
        $this->signed_in = false;
        //this unset code came from the discussin group
        //unset($_SESSION['user_id']);

    }


    private function check_the_login(){

        if(isset($_SESSION['user_id'])){

            $this->user_id = $_SESSION['user_id'];
            $this->signed_in = true;

        }else{

            unset($this->user_id);
            $this->signed_in = false;

        }

    }

}

$session = new Session();
$message = $session->message();


?>