php - dompdf 编号页面但跳过第一页

Question

我使用 dompdf 类，我需要为每个页面进行页面编号

我这样做了并且有效:

$dompdf = new Dompdf();
$dompdf->load_html($html);
$dompdf->render();

$canvas = $dompdf->get_canvas();
$font = $dompdf->getFontMetrics()->get_font("helvetica", "bold");

$canvas->page_text(72, 18, "Header: {PAGE_NUM}", $font, 6, array(0,0,0));

我需要的只是跳过第一页，从第二页开始编号。

我该怎么做？

Answer 1

这是对我有用的:

$dompdf = new Dompdf();
$dompdf->load_html($html);
$dompdf->render();

$canvas = $dompdf->get_canvas();
$cpdf = $canvas->get_cpdf();

$font = $dompdf->getFontMetrics()->get_font("helvetica", "bold");

$firstPageId = $cpdf->getFirstPageId();
$objects = $cpdf->objects;
$pages = array_filter($objects, function($v) {
    return $v['t'] == 'page';
});
$number = 1;
foreach($pages as $pageId => $page) {
    if(($pageId + 1) !== $firstPageId) {
        $canvas->reopen_object($pageId + 1);
        $canvas->text(72, 18, "Header: $number", $font, 6, array(0,0,0));
        $canvas->close_object();
        $number++;
    }
}

$dompdf->stream();

这是如何工作的:

1. 从https://github.com/dompdf/dompdf/blob/v0.8.2/lib/Cpdf.php#L32中获取所有页面
2. 将文本添加到除第一页以外的所有页面。