我正在尝试使用mpdf生成pdf，但是生成的pdf仅包含数组数据

Question

我正在尝试使用MPDF导出为pdf。生成的pdf仅显示数组数据。

这是针对在xampp服务器上运行的localhost的。 PHP版本7.1.26，Apache / 2.4.38（Win64）

(new CWidget())
->setTitle(_('Services'))
->setWebLayoutMode($page['web_layout_mode'])
->setControls(new CList([
(new CForm('get'))
->cleanItems()
->setAttribute('aria-label', _('Main filter'))
->addItem((new CList())
->addItem([
new CLabel(_('Period'), 'period'),
(new CDiv())->addClass(ZBX_STYLE_FORM_INPUT_MARGIN),
$period_combo
])
),
(new CTag('nav', true, get_icon('fullscreen')))->setAttribute('aria-label', _('Content controls'))
]))
->addItem(BR())
->addItem($tree->getHTML())
->show();
require_once _DIR_ .'/../../vendor/autoload.php';
ob_clean();
$mpdf = new \Mpdf\Mpdf(['debug' => true,'allow_output_buffering' => true]);
$stylesheet = file_get_contents($page['web_layout_mode']);
$mpdf->WriteHTML($stylesheet,\Mpdf\HTMLParserMode::DEFAULT_MODE);
$arr=$tree->getHTML();
$html='<div>'.json_encode($arr).'</div>';
$mpdf->WriteHTML($html, \Mpdf\HTMLParserMode::HTML_BODY);
$mpdf->Output();
}

OUTPUT:

The generated pdf contains these codes:

{"items":["\u003Cscript src=\"js\/class.ctree.js\"
type=\"text\/javascript\"\u003E\u003C\/script\u003E\n\u003Cscript type=\"text\/javascript\"\u003E
var service_status_tree_tree = {};service_status_tree_tree['0'] = { status: 'close', nodelist :

The actual result should be exact copy of the webpage info.