Php 在mpdf中生成自定义TOC时如何动态获取页码？

我试图在mpdf的第一页创建自定义TOC，但不确定如何获取动态内容的页码。有人能帮忙吗

        $html = '<div class="frame frame-top">
            <div class="mpdf_toc" id="mpdf_toc_0">
    <div class="mpdf_toc_level_0">
        <a class="mpdf_toc_a" href="#__mpdfinternallink_1">
            <span class="mpdf_toc_t_level_0">Section 1</span>
        </a>
        <dottab outdent="2em" />
        <a class="mpdf_toc_a" href="#__mpdfinternallink_1">
            <span class="mpdf_toc_p_level_0">5</span>
        </a>
    </div>
    <div class="mpdf_toc_level_1">
        <a class="mpdf_toc_a" href="#__mpdfinternallink_2">
            <span class="mpdf_toc_t_level_1">Chapter 1</span>
        </a>
        <dottab outdent="2em" />
        <a class="mpdf_toc_a" href="#__mpdfinternallink_2">
            <span class="mpdf_toc_p_level_1">5</span>
        </a>
    </div>
    <div class="mpdf_toc_level_2">
        <a class="mpdf_toc_a" href="#__mpdfinternallink_3">
            <span class="mpdf_toc_t_level_2">Topic 1</span>
        </a>
        <dottab outdent="2em" />
        <a class="mpdf_toc_a" href="#__mpdfinternallink_3">
            <span class="mpdf_toc_p_level_2">5</span>
        </a>
    </div>
</div>

$html='1！'

您不能，当调用

Output（）

方法并最终确定内容时，页面是在将文档放在一起的过程中确定的