DOMDocument从HTML源代码中删除脚本标签 [英] DOMDocument remove script tags from HTML source
问题描述
我使用 @Alex在这里使用的方法从HTML删除脚本标签使用内置的DOMDocument文档.问题是，如果我有一个包含Javascript内容的脚本标签，然后又有一个链接到外部Javascript源文件的脚本标签，那么不是所有的脚本标签都已从HTML中删除.
I used @Alex's approach here to remove script tags from a HTML document using the built in DOMDocument. The problem is if I have a script tag with Javascript content and then another script tag that links to an external Javascript source file, not all script tags are removed from the HTML.
$result = '
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>
hey
</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
alert("hello");
</script>
</head>
<body>hey</body>
</html>
';
$dom = new DOMDocument();
if($dom->loadHTML($result))
{
$script_tags = $dom->getElementsByTagName('script');
$length = $script_tags->length;
for ($i = 0; $i < $length; $i++) {
if(is_object($script_tags->item($i)->parentNode)) {
$script_tags->item($i)->parentNode->removeChild($script_tags->item($i));
}
}
echo $dom->saveHTML();
}
上面的代码输出:
<html>
<head>
<meta charset="utf-8">
<title>hey</title>
<script>
alert("hello");
</script>
</head>
<body>
hey
</body>
</html>
从输出中可以看到，仅除去了外部脚本标记.我有什么办法确保删除所有脚本标签?
As you can see from the output, only the external script tag was removed. Is there anything I can do to ensure all script tags are removed?
推荐答案
您的错误实际上是微不足道的.一个DOMNode对象(及其所有后代-DOMElement，DOMNodeList和其他几个对象！)在其父元素发生更改时会自动更新，尤其是在其子级数目发生更改时会自动更新.这是写在PHP文档中的两行代码上，但大多被掩盖了.
Your error is actually trivial. A DOMNode object (and all its descendants - DOMElement, DOMNodeList and a few others!) is automatically updated when its parent element changes, most notably when its number of children change. This is written on a couple of lines in the PHP doc, but is mostly swept under the carpet.
如果使用($k instanceof DOMNode)->length循环，然后从节点中删除元素，则会注意到length属性实际上发生了变化！我必须编写自己的库来抵消此问题和其他一些怪癖.
If you loop using ($k instanceof DOMNode)->length, and subsequently remove elements from the nodes, you'll notice that the length property actually changes! I had to write my own library to counteract this and a few other quirks.
解决方案:
if($dom->loadHTML($result))
{
while (($r = $dom->getElementsByTagName("script")) && $r->length) {
$r->item(0)->parentNode->removeChild($r->item(0));
}
echo $dom->saveHTML();
我实际上并没有在循环-只是一次弹出第一个元素.结果: http://sebrenauld.co.uk/domremovescript.php
I'm not actually looping - just popping the first element one at a time. The result: http://sebrenauld.co.uk/domremovescript.php
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