Pimcore\Document\Adapter\Ghostscript::getPageCount PHP Method

    public function getPageCount()
    {
        $pages = Console::exec(self::getGhostscriptCli() . " -dNODISPLAY -q -c '(" . $this->path . ") (r) file runpdfbegin pdfpagecount = quit'", null, 120);
        $pages = trim($pages);
        if (!is_numeric($pages)) {
            throw new \Exception("Unable to get page-count of " . $this->path);
        }
        return $pages;
    }