ions($options);
        }
        return $this;
    }

    /**
     * @return Options
     */
    public function getOptions()
    {
        return $this->options;
    }

    /**
     * @return array
     * @deprecated
     */
    public function get_callbacks()
    {
        return $this->getCallbacks();
    }

    /**
     * Returns the callbacks array
     *
     * @return array
     */
    public function getCallbacks()
    {
        return $this->callbacks;
    }

    /**
     * @param array $callbacks the set of callbacks to set
     * @return $this
     * @deprecated
     */
    public function set_callbacks($callbacks)
    {
        return $this->setCallbacks($callbacks);
    }

    /**
     * Define callbacks that allow modifying the document during render.
     *
     * The callbacks array should contain arrays with `event` set to a callback
     * event name and `f` set to a function or any other callable.
     *
     * The available callback events are:
     * * `begin_page_reflow`: called before page reflow
     * * `begin_frame`: called before a frame is rendered
     * * `end_frame`: called after frame rendering is complete
     * * `begin_page_render`: called before a page is rendered
     * * `end_page_render`: called after page rendering is complete
     * * `end_document`: called for every page after rendering is complete
     *
     * The function `f` receives three arguments `Frame $frame`, `Canvas $canvas`,
     * and `FontMetrics $fontMetrics` for all events but `end_document`. For
     * `end_document`, the function receives four arguments `int $pageNumber`,
     * `int $pageCount`, `Canvas $canvas`, and `FontMetrics $fontMetrics` instead.
     *
     * @param array $callbacks The set of callbacks to set.
     * @return $this
     */
    public function setCallbacks(array $callbacks): self
    {
        $this->callbacks = [];

        foreach ($callbacks as $c) {
            if (is_array($c) && isset($c["event"]) && isset($c["f"])) {
                $event = $c["event"];
                $f = $c["f"];
                if (is_string($event) && is_callable($f)) {
                    $this->callbacks[$event][] = $f;
                }
            }
        }

        return $this;
    }

    /**
     * @return boolean
     * @deprecated
     */
    public function get_quirksmode()
    {
        return $this->getQuirksmode();
    }

    /**
     * Get the quirks mode
     *
     * @return boolean true if quirks mode is active
     */
    public function getQuirksmode()
    {
        return $this->quirksmode;
    }

    /**
     * @param FontMetrics $fontMetrics
     * @return $this
     */
    public function setFontMetrics(FontMetrics $fontMetrics)
    {
        $this->fontMetrics = $fontMetrics;
        return $this;
    }

    /**
     * @return FontMetrics
     */
    public function getFontMetrics()
    {
        return $this->fontMetrics;
    }

    /**
     * PHP5 overloaded getter
     * Along with {@link Dompdf::__set()} __get() provides access to all
     * properties directly.  Typically __get() is not called directly outside
     * of this class.
     *
     * @param string $prop
     *
     * @throws Exception
     * @return mixed
     */
    function __get($prop)
    {
        switch ($prop) {
            case 'version':
                return $this->version;
            default:
                throw new Exception('Invalid property: ' . $prop);
        }
    }
}