/** * Write a string to standard error output. * * @param string $text The text to display. * @param boolean $nl True (default) to append a new line at the end of the output string. * * @return AbstractCommand Instance of $this to allow chaining. * * @since 2.0 */ public function err($text = '', $nl = true) { $this->io->err($text, $nl); return $this; }