DOMDocument从HTML源中删除脚本标记
[英]DOMDocument remove script tags from HTML source
问题描述
I used @Alex's approach here to remove script tags from a HTML document using the built in DOMDocument. 
我在这里使用@Alex的方法使用内置的DOMDocument从HTML文档中删除脚本标记。 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. 问题是，如果我有一个带有Javascript内容的脚本标记，然后是另一个链接到外部Javascript源文件的脚本标记，则不会从HTML中删除所有脚本标记。
$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 $dom->saveHTML();
}
The above code outputs: 以上代码输出：
<html>
<head>
<meta charset="utf-8">
<title>hey</title>
<script>
alert("hello");
</script>
</head>
<body>
hey
</body>
</html>
As you can see from the output, only the external script tag was removed. 从输出中可以看出，只删除了外部脚本标记。 Is there anything I can do to ensure all script tags are removed? 有什么办法可以确保删除所有脚本标记吗？
2 个解决方案
解决方案1
23 已采纳 2013-04-10 12:44:25
Your error is actually trivial. 你的错误实际上是微不足道的。 A DOMNode object (and all its descendants - DOMElement , DOMNodeList and a few others!) is automatically updated when its parent element changes, most notably when its number of children change. 一个DOMNode对象（及其所有后代- DOMElement ， DOMNodeList ！和其他一些），当它的父元素的变化，最明显的是当其子女人数变化自动更新。 This is written on a couple of lines in the PHP doc, but is mostly swept under the carpet. 这是在PHP文档的几行中写的，但大多数都是在地毯下。
If you loop using ($k instanceof DOMNode)->length , and subsequently remove elements from the nodes, you'll notice that the length property actually changes! 如果你使用($k instanceof DOMNode)->length循环，然后从节点中删除元素，你会发现length属性实际上发生了变化！ I had to write my own library to counteract this and a few other quirks. 我不得不写自己的库来抵消这个和其他一些怪癖。
The solution: 解决方案：
if($dom->loadHTML($result))
{
while (($r = $dom->getElementsByTagName("script")) && $r->length) {
$r->item(0)->parentNode->removeChild($r->item(0));
}
echo $dom->saveHTML();
I'm not actually looping - just popping the first element one at a time. 我实际上并没有循环 - 只需一次弹出第一个元素。 The result: http://sebrenauld.co.uk/domremovescript.php 结果： http ： //sebrenauld.co.uk/domremovescript.php
解决方案2
8 2016-06-10 23:07:15
To avoid that you get the surprises of a live node list -- that gets shorter as you delete nodes -- you could work with a copy into an array using iterator_to_array : 为了避免您获得实时节点列表的惊喜 - 随着删除节点而缩短 - 您可以使用iterator_to_array将副本复制到数组中：
foreach(iterator_to_array($dom->getElementsByTagName($tag)) as $node) {
$node->parentNode->removeChild($node);
};
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