PHP DOM 用新元素替换元素
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PHP DOM replace element with a new element
提问by Richard Knop
I have a DOM object with loaded HTML markup. I'm trying to replace all embed tags that look like this:
我有一个加载了 HTML 标记的 DOM 对象。我正在尝试替换所有看起来像这样的嵌入标签：
<embed allowfullscreen="true" height="200" src="path/to/video/1.flv" width="320"></embed>
With a tag like this:
使用这样的标签：
<a
href="path/to/video/1.flv"
style="display:block;width:320px;height:200px;"
id="player">
</a>
I'm having troubles figuring this out and I don't want to use regular expression for this. Could you help me out?
我在弄清楚这一点时遇到了麻烦，我不想为此使用正则表达式。你能帮我吗？
EDIT:
编辑：
This is what I have so far:
这是我到目前为止：
// DOM initialized above, not important
foreach ($dom->getElementsByTagName('embed') as $e) {
$path = $e->getAttribute('src');
$width = $e->getAttribute('width') . 'px';
$height = $e->getAttribute('height') . 'px';
$a = $dom->createElement('a', '');
$a->setAttribute('href', $path);
$a->setAttribute('style', "display:block;width:$width;height:$height;");
$a->setAttribute('id', 'player');
$dom->replaceChild($e, $a); // this line doesn't work
}
回答by bobince
It's easy to find elements from a DOM using getElementsByTagName. Indeed you wouldn't want to go near regular expressions for this.
使用getElementsByTagName. 实际上，您不想为此接近正则表达式。
If the DOM you are talking about is a PHP DOMDocument, you'd do something like:
如果您正在谈论的 DOM 是 PHP DOMDocument，您会执行以下操作：
$embeds= $document->getElementsByTagName('embed');
foreach ($embeds as $embed) {
$src= $embed->getAttribute('src');
$width= $embed->getAttribute('width');
$height= $embed->getAttribute('height');
$link= $document->createElement('a');
$link->setAttribute('class', 'player');
$link->setAttribute('href', $src);
$link->setAttribute('style', "display: block; width: {$width}px; height: {$height}px;");
$embed->parentNode->replaceChild($link, $embed);
}
Edit re edit:
编辑重新编辑：
$dom->replaceChild($e, $a); // this line doesn't work
Yeah, replaceChildtakes the new element to replace-with as the first argument and the child to-be-replaced as the second. This is not the way round you might expect, but it is consistent with all the other DOM methods. Also it's a method of the parent node of the child to be replaced.
是的，replaceChild将要替换的新元素作为第一个参数，将要替换的子元素作为第二个参数。这不是您所期望的方式，但它与所有其他 DOM 方法一致。它也是要替换子节点的父节点的一种方法。
(I used classnot id, as you can't have multiple elements on the same page all called id="player".)
（我使用classnot id，因为您不能在同一页面上有多个元素都称为id="player"。）
