使用PHP的DOM类替换DOMNode [英] DOMNode replacement with PHP's DOM classes
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问题描述
给定文件， ZuqML_test_100.html ：
<！DOCTYPE html PUBLIC - // W3C // DTD XHTML 1.0 Strict // ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">
< html xmlns =http://www.w3.org/1999/xhtmlxmlns：zuq =http：// localhost /〜/ zuqml>
< head>
< meta http-equiv =Content-Typecontent =text / html; charset = utf-8/>
< title> Untitled Document< / title>
< / head>
< body>
< h1>
< zuq：data name =siteHeader/>
< / h1>
< h2>
< zuq：data name =pageHeaderName/>
< span>& nbsp; |& nbsp;< / span>
< zuq：data name =pageHeaderTitle/>
< / h2>
< zuq：region name =post>
< zuq：param name =onEmpty>
< div class =post noposts>
< p>目前没有任何要显示的帖子。< / p>
< / div>
< / zuq：param>
< div class =post>
< h3>< zuq：data name =postHeader/>< / h3>
< p>
< zuq：data name =postText>
< zuq：format type =trim>
< zuq：param name =length> 300< / zuq：param>
< zuq：param name =append>
< a>
< zuq：attr name =href>
./?action=viewpost&id=<zuq:data name =postId/>
< / zuq：attr>
< zuq：data name =postAuthor/>
< / a>
< / zuq：param>
< / zuq：format>
< / zuq：data>
< / p>
< / div>
< / zuq：region>
< / body>
< / html>
我试图替换所有< zuq：data /> 节点带有一个简单的文本节点，值为 foo 。我正在使用以下代码片段：
$ root = new DOMDocument（）;
@ $ root-> load（'ZuqML_test_100.html'）;
foreach（$ root-> getElementsByTagNameNS（$ root-> lookupNamespaceURI（'zuq'），'data'）作为$ node）{
$ node-> parentNode-> ; replaceChild（$ node-> ownerDocument-> createTextNode（'foo'），$ node）;
}
echo $ root-> saveXML（）;
它的作品类型，但是我的输出仍然包含< zuq ：data /> 节点，如下所示：
<？xml version =1.0 >？;
<！DOCTYPE html PUBLIC - // W3C // DTD XHTML 1.0 Strict // ENhttp://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">
< html xmlns =http://www.w3.org/1999/xhtmlxmlns：zuq =http://ichorworkstudios.no-ip.org/~/zuqml>
< head>
< meta http-equiv =Content-Typecontent =text / html; charset = utf-8/>
< title> Untitled Document< / title>
< / head>
< body>
< h1>
foo
< / h1>
< h2>
< zuq：data name =pageHeaderName>< / zuq：data>
< span>& mdash;< / span>
foo
< / h2>
< zuq：region name =post>
< zuq：param name =onEmpty>
< div class =post noposts>
< p>目前没有任何要显示的帖子。< / p>
< / div>
< / zuq：param>
< div class =post>
< h3>< zuq：data name =postHeader>< / zuq：data>< / h3>
< p>
foo
< / p>
< / div>
< / zuq：region>
< / body>
< / html>
为什么有些< zuq：data /> 节点遗留下来？
解决方案
我认为这与迭代的方式有关。您正在改变结果列表，因为它被反复，所以它绕开了（副作用）。尝试将您的循环更改为：
$ nodes = $ root-> getElementsByTagNameNS（$ root-> lookupNamespaceURI（'zuq '），'data'）;
$ i = $ nodes-> length - 1;
while（$ i> = 0）{
$ node = $ nodes-> item（$ i）;
$ node-> parentNode-> replaceChild（
$ node-> ownerDocument-> createTextNode（'foo'），
$ node
）;
$ i--;
}
基本上，它只是循环遍历节点列表，这样当节点被删除，它们从结尾而不是开始删除...
I'm learning to work with the DOM* classes available in PHP, and have noticed (what I think is) an irregularity in my testing.
Given this document, ZuqML_test_100.html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:zuq="http://localhost/~/zuqml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<h1>
<zuq:data name="siteHeader" />
</h1>
<h2>
<zuq:data name="pageHeaderName" />
<span> | </span>
<zuq:data name="pageHeaderTitle" />
</h2>
<zuq:region name="post">
<zuq:param name="onEmpty">
<div class="post noposts">
<p>There are no posts to show at this time.</p>
</div>
</zuq:param>
<div class="post">
<h3><zuq:data name="postHeader" /></h3>
<p>
<zuq:data name="postText">
<zuq:format type="trim">
<zuq:param name="length">300</zuq:param>
<zuq:param name="append">
<a>
<zuq:attr name="href">
./?action=viewpost&id=<zuq:data name="postId" />
</zuq:attr>
<zuq:data name="postAuthor" />
</a>
</zuq:param>
</zuq:format>
</zuq:data>
</p>
</div>
</zuq:region>
</body>
</html>
I'm trying to replace all <zuq:data /> nodes with a simple text node with the value foo. I'm doing so with the following snippet:
$root = new DOMDocument();
@$root->load('ZuqML_test_100.html');
foreach($root->getElementsByTagNameNS($root->lookupNamespaceURI('zuq'), 'data') as $node){
$node->parentNode->replaceChild($node->ownerDocument->createTextNode('foo'), $node);
}
echo $root->saveXML();
It sort of works, however my output still appears to contain <zuq:data /> nodes, as shown here:
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:zuq="http://ichorworkstudios.no-ip.org/~/zuqml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<h1>
foo
</h1>
<h2>
<zuq:data name="pageHeaderName"></zuq:data>
<span>—</span>
foo
</h2>
<zuq:region name="post">
<zuq:param name="onEmpty">
<div class="post noposts">
<p>There are no posts to show at this time.</p>
</div>
</zuq:param>
<div class="post">
<h3><zuq:data name="postHeader"></zuq:data></h3>
<p>
foo
</p>
</div>
</zuq:region>
</body>
</html>
Why is it that some <zuq:data /> nodes are left behind?
解决方案
I think it has to do with how you're iterating. You're changing the result list as it's being iterated against, so it winds up breaking (side-effects). Try changing your loop to this:
$nodes = $root->getElementsByTagNameNS($root->lookupNamespaceURI('zuq'), 'data');
$i = $nodes->length - 1;
while ($i >= 0) {
$node = $nodes->item($i);
$node->parentNode->replaceChild(
$node->ownerDocument->createTextNode('foo'),
$node
);
$i--;
}
Basically, it just iterates backwards over the list of nodes, so that when nodes are removed, they are removed from the end rather than the beginning...
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