Question

可能重复：
Class encapsulating $_SESSION - problem

包括/ session.php文件：

/*
    Use the static method getInstance to get the object.
*/

class Session
{
    const SESSION_STARTED = TRUE;
    const SESSION_NOT_STARTED = FALSE;

    // The state of the session
    private $sessionState = self::SESSION_NOT_STARTED;

    // THE only instance of the class
    private static $instance;

    protected function __construct() { }

    public function __destruct() {
      session_write_close();
    }


    /**
    *    Returns THE instance of 'Session'.
    *    The session is automatically initialized if it wasn't.
    *    
    *    @return    object
    **/

    public static function GetInstance()
    {
        if ( !isset(self::$instance))
        {
            self::$instance = new self;
        }

        self::$instance->startSession();

        return self::$instance;
    }

    public function getID() {
      return session_id();
    }


    /**
    *    (Re)starts the session.
    *    
    *    @return    bool    TRUE if the session has been initialized, else FALSE.
    **/

    public function startSession()
    {
        if ( $this->sessionState == self::SESSION_NOT_STARTED )
        {
            $this->sessionState = session_start();
        }

        return $this->sessionState;
    }


    /**
     *    Creates a new session.
     **/         
    public function newSession() {
        return session_regenerate_id(true);
    }


    /**
    *    Stores datas in the session.
    *    Example: $instance->foo = 'bar';
    *    
    *    @param    name    Name of the datas.
    *    @param    value    Your datas.
    *    @return    void
    **/

    public function __set( $name , $value )
    {
        $_SESSION[$name] = $value;
    }


    /**
    *    Gets datas from the session.
    *    Example: echo $instance->foo;
    *    
    *    @param    name    Name of the datas to get.
    *    @return    mixed    Datas stored in session.
    **/

    public function __get( $name )
    {
        if ( isset($_SESSION[$name]))
        {
            $ret = $_SESSION[$name];
            return $ret;
        }
    }


    public function __isset( $name )
    {
        return isset($_SESSION[$name]);
    }


    public function __unset( $name )
    {
        unset( $_SESSION[$name] );
    }


    /**
    *    Destroys the current session.
    *    
    *    @return    bool    TRUE is session has been deleted, else FALSE.
    **/

    public function destroy()
    {    
      session_start();
      session_unset();
      session_destroy();
    }
}

?>

test.php的：

<?php

require_once('include/session.php');

$session = Session::GetInstance();
$session->foo = 'bar';
$session->baz = array();
$session->baz['foo'] = 'bar';
$session->baz['derp'] = array();
$session->baz['derp']['php_sucks'] = 'this will never work';

var_dump($session->foo); echo '<br>';
var_dump($session->baz); echo '<br>';
var_dump($session->baz['foo']); echo '<br>';
var_dump($session->baz['derp']); echo '<br>';
var_dump($session->baz['derp']['php_sucks']); echo '<br>';


?>

输出：

string(3) "bar" 
array(0) { } 
NULL 
NULL 
NULL

为什么$ session-＆gt; baz数组没有被填充？

Answer 1

当您调用$ session-＆gt; baz ['foo']时，$ session-＆gt; baz会返回会话中数组的副本，然后向其中添加'foo'元素。此副本不是您班级内的副本，几乎立即被丢弃。

你需要改变处理数组的方式，即使用一些getter和setter（包括魔术数组），或者研究如何通过引用而不是复制来获取'baz'元素。

封装$ _SESSION的类 - 问题

1 个答案: