<?php
    class SessionShell{
        public function __construct()
        {
            if(!isset($_SESSION)){
                session_start();
            }
        }
        public function set($name,$value){
            $_SESSION[$name] = $value;
        }
        public function get($name){
            return $_SESSION[$name];
        }
        public function del($name){
            unset($_SESSION[$name]);
        }
        public function exists($name){
            if(isset($_SESSION[$name])){
                return true;
            } else {
                return false;
            }
        }
        public function destroy(){
            session_destroy();
        }
    }
    $ses = new SessionShell;
    $ses -> set("Test","hello world!");
    $ses -> del("Test");
    $ses -> destroy();
    $_SESSION['testing'] = "test";
    echo $_SESSION['testing'];
?>