PHP-HTMLDOM解析-在<；视频>；标签

我喜欢将html

转换为amp

，如果使用的浏览器不支持HTML5，我的问题是回退文本

<video width="320" height="240" controls>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
  Your browser does not support the video tag.
</video>

有什么想法吗

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安德烈亚斯

我找到了这个，它成功了。演示：但是你需要做一些工作来完成你需要做的。@alistaircol:对不起，你不明白我的问题。。。我想用div和p标记包围回退文本，正如您在amp视频示例中看到的那样……我发现了这个，它起了作用。演示：但是你需要做一些工作来完成你需要做的。@alistaircol:对不起，你不明白我的问题。。。我想用div和p标记包围回退文本，正如您在amp视频示例中看到的那样。。。

<amp-video width=320 height=240 src="https://yourhost.com/videos/movie.mp4"
    poster="movie-poster.jpg">
  <source type="video/mp4" src="movie.mp4">
  <source type="video/ogg" src="movie.ogg">
  <div fallback><p>
    Your browser doesn’t support HTML5 video
  </p></div>
</amp-video>

<?php
    $html = '<video width="320" height="240" controls><source src="movie.mp4" type="video/mp4"><source src="movie.ogg" type="video/ogg">Your browser does not support the video tag.</video>';

    $dom = new DOMDocument;
    $dom->loadHTML($html);

    $checks = $dom->getElementsByTagName('video');
    if ($checks != '') {
       foreach ($checks as $check) {
           echo $check->textContent;
       }
    }
?>

<?php
$html = '<video width="320" height="240" controls><source src="movie.mp4" type="video/mp4"><source src="movie.ogg" type="video/ogg">Your browser does not support the video tag.</video>';

$dom = new DOMDocument;
libxml_use_internal_errors(true);
$dom->loadHTML($html);
libxml_clear_errors();

$checks = $dom->getElementsByTagName('video');
if ($checks != '') {
   foreach ($checks as $check) {

    $newdoc = new DOMDocument();
    $cloned = $check->cloneNode(TRUE);
    $newdoc->appendChild($newdoc->importNode($cloned,TRUE));

    $fallback = $newdoc->saveHTML();   
    $fallbacktext = strip_tags($fallback);
    echo $fallbacktext;
    echo $fallback;

    //$fallbacktext = "Your browser does not support the video tag.";

    echo str_replace($fallbacktext,'hello',$fallback);

   }
}

$html = $dom->saveHTML();

//echo $html;

?>