What is wrong with my usage of isset ?

If I'm reading PHP's documentation correctly, the Session library would have to define __isset() for this to work properly. It might also be worthwhile to define __unset().

__isset() might look something like this (based on the current definition of __get()):

PHP Code:

public function __isset($key)
{
    if (isset($_SESSION[$key])) 
    {
        return isset($_SESSION[$key]);
    } 
    elseif ($key === 'session_id') 
    {
        return session_id() !== '';
    }

    return FALSE;
} 


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