我将如何传递数组作为__set magic方法的键

Question

I have a php singleton session class as follows.

class Session {

    static private $_instance = NULL;

    private function __construct() 
    {
        session_start();
    }

    /**
    * Prevents the class from being cloned
    * @return NULL
    */
    private function __clone() { }

    /**
    * Returns the singleton instance of this class
    * @return Session
    */
    public static function getInstance() 
    {
        if (!self::$_instance) {
            self::$_instance = new Session();
        }
        return self::$_instance;
    }

    public function __get($key) {
        if (isset($_SESSION[$key])) {
            return $_SESSION[$key];
        }
        return NULL;
    }

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

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

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


}

I can create an object as follows

$session = Session::getInstance();
$session->name = 'some name';

I can also get the value like

echo $session->name;

The problem is, i want to pass an array to this object and it is not working. for example, i wan to set something like

$_SESSION['user']['data'] = array('name'=>'some name',"empId"=>'123');

I am trying like this.

$session->['user']['data'] = array('name'=>'some name',"empId"=>'123');

but it is not working. Could you please suggest what is wrong.

Answer 1

The workaround in this case would be to use:

public function &__get($key) {
    if (isset($_SESSION[$key])) {
        return & $_SESSION[$key];
    }
    return NULL;
}

You need to modify the __get() method, because an assignment like

$session->user['data'] = ...

will actually retrieve the [user] key, and then try to assign a new subarray [data] to that temporary array result.

Also note that $session->['user']['data'] is invalid syntax. You either need $session->user['data'] or $session->{'user'}['data'] .

Anyway, I think it is probably not a good idea to use a wrapper if you often want to do assignments like that. (I do actually have something very similar.)

Answer 2

$session->user = array('data' => array('name'=>'some name',"empId"=>'123'));

确保您不会覆盖要保留的user任何其他内容