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

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]);
	}
}