php session 登录

<?php
    
class FileSessionHandler
{
    private $savePath;

    public function __construct($savePath)
    {
        ini_set('session.serialize_handler', 'php_serialize');

        $this->savePath = $savePath;

        session_set_save_handler(
        array($this, 'open'),
        array($this, 'close'),
        array($this, 'read'),
        array($this, 'write'),
        array($this, 'destroy'),
        array($this, 'gc')
        );
    }

    function open($savePath, $sessionName)
    {    
        echo __METHOD__."<br/>";
        return true;
    }

    function close()
    {
        echo __METHOD__."<br/>";
        return true;
    }

    function read($id)
    {
        echo __METHOD__."<br/>";
         foreach (glob("$this->savePath/sess_{$id}_*") as $file) {
             return (string)@file_get_contents($file);
        }
    }

    function write($id, $data)
    {

        echo __METHOD__."<br/>";
        $arr = unserialize($data);
        if(array_key_exists('user', $arr))
        {
            $user = $arr['user'];

             foreach (glob("$this->savePath/sess_*_$user") as $file) {
                 unlink($file);
            }

            return file_put_contents("$this->savePath/sess_{$id}_$user", $data) === false ? false : true;
        }
        else
        {
            return file_put_contents("$this->savePath/sess_{$id}_", $data) === false ? false : true;
        }
    }

    function destroy($id)
    {
        echo __METHOD__."<br/>";
        $file = "$this->savePath/sess_$id";
        if (file_exists($file)) {
            unlink($file);
        }

        return true;
    }

    function gc($maxlifetime)
    {
        echo __METHOD__."<br/>";
        foreach (glob("$this->savePath/sess_*") as $file) {
            if (filemtime($file) + $maxlifetime < time() && file_exists($file)) {
                unlink($file);
            }
        }

        return true;
    }

    function get($key=null)
    {
        if($key === null) return $_SESSION;
        else  return isset($_SESSION[$key])? $_SESSION[$key] : '';
    }

       function set($key, $data)
    {    
        return $_SESSION[$key] = $data;
        
    }
}

$handler = new FileSessionHandler('E:\localhost\sessions');



session_start();

print_r($handler->get());

// $handler->set('user', 1);

// print_r($handler->get());

// echo  '*********************<br/>';

/*$handler->set('user', 1);

print_r($handler->get());*/


class login {

    private $sessionHandler;

    public function __construct(FileSessionHandler $sessionHandler)
    {
        $this->sessionHandler = $sessionHandler;
    }

    public  function login()
    {
        if($this->sessionHandler->get())
        {
            $this->index();
        }
        else
        {
            $user = $_GET['user'];
            $this->sessionHandler->set('user', $user);
        }
    }


    public function index()
    {
        echo '您已登录！';
    }

}

/*$arr['a'] = 1;

var_dump(serialize($arr));*/

session 顺序