class PLException extends Exception 
{
	protected $messages = array(
		);

	public function __construct($code) { 
		$args = func_get_args();
		array_shift($args);
		if (array_key_exists($code, $this->messages)) {
			$message = vsprintf($this->messages[$code], $args);
		} else {
			$message = "Unknown error ".$code;
		}
		parent::__construct($message, $code);
	}

}

class PLConfigException extends PLException
{
	protected $messages = array(
		1 => "Couldn't open \"%s\" for reading",
		2 => "Invalid configuration option \"%s\" in %s, line %s",
		);
}