PHP overloading return by reference, update value in array

Question

I have a class for session handling that uses object overloading for __GET and __SET, I've been having issues with arrays and read to assign get by reference, such as &__GET

The problem is I can't update the values. For example, let's say I have this:

$session->item['one']['name']

I'd like to change it, by assigning it a new value; $session->item['one']['name'] = 'new value' However, it doesn't change.

Any ideas how to work around this? Below is the code, thank you!

class Session 
{

    private $_session = array();

    public function __construct()
    {

        if(!isset($_SESSION)) {
            session_start();
        }
        $this->_session = $_SESSION;
    }

    public function __isset($name)
    {
        return isset($this->_session[$name]);
    }

    public function __unset($name)
    {
        unset($_SESSION[$name]);
        unset($this->_session[$name]);
    } 

    public function &__get($name)
    {

        return $this->_session[$name];

    }

    public function __set($name, $val)
    {     
         $_SESSION[$name] = $val;
         $this->_session[$name] = $val;
    }

    public function getSession()
    {
        return (isset($this->_session)) ? $this->_session : false;
    }

    public function getSessionId()
    {
        return (isset($_SESSION)) ? session_id() : false;
    }


    public function destroy()
    {
        $_SESSION = array();
        session_destroy();
        session_write_close();
        unset($this->_session);
    }

}

Not posting this as an answer because I have no clue if it matters with $_SESSION, but have you tried doing $this->_session = &$_SESSION; in your constructor instead of how you're setting it now? — jprofitt
– jprofitt, Commented Dec 22, 2011 at 18:07
No I haven't and I just did and it freakin' works! Thank you! Please post as answer. — David
– David, Commented Dec 22, 2011 at 18:09

jprofitt · Accepted Answer · 2011-12-22 18:13:42Z

3

In your constructor, change $this->_session = $_SESSION; to $this->_session = &$_SESSION; so you're getting a reference to it inside of your class.

answered Dec 22, 2011 at 18:13

jprofitt

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1 Comment

hakre Over a year ago

If you finish the session, the reference still exists, however, it's not a reference to the (then current) superglobal any longer. So this is not compatible if you start a session, close it, and then start a second one in the same request. Implementing ArrayAccess can help here.

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