if(!function_exists("session_is_registered"))
{
	function session_is_registered($key)
	{
		return array_key_exists($key, $_SESSION);
	}
}

if(!function_exists("session_register"))
{
    function session_register() {
		$args = func_get_args();
		
		if(count($args) <= 0)
		{
			return;
		}
		
		foreach($args as $key)
		{
			$_SESSION[$key] = $GLOBALS[$key];
		}
	}
}

if(!function_exists("session_unregister"))
{
	function session_unregister($key)
	{
		unset($_SESSION[$key]);
	}
}