我试图在 DOMDocument 节点循环中按特定类名(类名 ='foo' 的 div)查找子节点。如果存在，则应将我的 foo 值设置为 1:
我的 HTML $document 看起来像:
...
<div class="posts">Div Posts 1</div>
<div class="posts">Div Posts 2<div class="foo"></div></div>
<div class="posts">Div Posts 3</div>
<div class="posts">Div Posts 4<div class="foo"></div></div>
<div class="posts">Div Posts 5</div>
...
DOMDocument/Xpath ($document):
$html = array();
$document = new \DOMDocument();
$document->loadHTMLFile($url); // loads html from above
$xpath = new \DOMXPath($document);
$i=0;
foreach ($xpath->query(Parser::cssToXpath('.posts')) as $node) {
$html['posts'][$i]['content'] = $node->nodeValue;
// check if child node with class name 'foo' exists => doesn't work :(
$children = $node->getElementsByTagName('foo');
if($children)
$html['posts'][$i]['foo'] = '1';
else
$html['posts'][$i]['foo'] = '0';
$i++;
}
输出:
[posts] => Array
(
[0] => Array
(
[content] => Div class Posts 1
[foo] => 1
)
[1] => Array
(
[content] => Div class Posts 2
[foo] => 1
)
[2] => Array
(
[content] => Div class Posts 3
[foo] => 1
)
[3] => Array
(
[content] => Div class Posts 4
[foo] => 1
)
[4] => Array
(
[content] => Div class Posts 5
[foo] => 1
)
)
getElementsByTagName() 可能不是正确的方法，但我已经尝试了不同的方法，但没有找到正确的方法。 :(
最佳答案
根据您的评论
Hm yes but still doesn't work unfortunately. Eventually I need to know which .posts div has the child element 'foo' because I need to analyze the content of that parent and also need to replace it later对于之前的答案，您的谓词可能是:
a) 选择 div 元素
b) 属性 class=posts
c) 并带有子元素 div
d) 具有属性 class=foo
作为 xpath 表达式:
a)//div
b)//div[ @class="posts"]
c)//div[ @class="posts"和 div ]
d)//div[ @class="posts"和 div[ @class="foo"] ]
例如
<?php
$doc = new DOMDocument;
$doc->loadhtml( getData() );
$xpath = new DOMXPath($doc);
/*
use something like
//div[contains(concat(' ',normalize-space(@class),' '),' post ')]
if the html element may have class="post lalala"
*/
foreach( $xpath->query('//div[@class="posts" and div[@class="foo"]]') as $post) {
while ( $post->firstChild ) {
$post->removeChild( $post->firstChild );
}
$post->appendChild( $doc->createElement('span', 'The quick fox....') );
}
echo $doc->savehtml();
function getData() {
return <<< eoh
<html><head><title>...</title></head><body>
<div class="posts">Div Posts 1</div>
<div class="posts">Div Posts 2<div class="foo"></div></div>
<div class="posts">Div Posts 3</div>
<div class="posts">Div Posts 4<div class="foo"></div></div>
<div class="posts">Div Posts 5</div>
</body></html>
eoh;
}
打印
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><head><title>...</title></head><body>
<div class="posts">Div Posts 1</div>
<div class="posts"><span>The quick fox....</span></div>
<div class="posts">Div Posts 3</div>
<div class="posts"><span>The quick fox....</span></div>
<div class="posts">Div Posts 5</div>
</body></html>
关于php - XPath/Domdocument 按类名检查子级，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9362165/