[英]How to extract the text using XPath between tag and some end tag
我给出了以下 HTML。 class 名称始终相同。 只有标签之间的文本有所不同,并且具有不同的长度和内容。
<a>
<span class="xxx">Not this text <span class="yyy">not this text</span> <span class="zzz">This is</span> the required text <q class="aaa">this not</q></span>
</a>
如何提取带有 class "zzz" 的标签和行尾之间的内容,但结果中不应包含带有 class "aaa" 的元素? 可能吗?
带有 class "aaa" 的元素可能存在或不存在:
<a>
<span class="xxx">Not this text <span class="yyy">not this text</span> <span class="zzz">This is</span> the required text</span>
</a>
预期的结果应该是:
This is the required text
“所需文本”部分也可能存在或不存在:
<a>
<span class="xxx">Not this text <span class="yyy">not this text</span> <span class="zzz">This is</span></span>
</a>
所以结果应该是:
This is
我使用 DOMXPath 在 PHP 中尝试这个。
XPath解决方案:
$xml = <<<'XML'
<a><span class="xxx">Not this text <span class="yyy">not this text</span> <span class="zzz">This is</span> the required text</span></a>
XML;
$document = new DOMDocument();
$document->loadXML($xml);
$xpath = new DOMXpath($document);
$elements = $xpath->query('//text()[parent::*[not(@class="aaa")]][preceding::span[@class="yyy"]][normalize-space()]');
foreach($elements as $element)
echo $element->nodeValue;
Output:
This is the required text
我不知道如何使用 XPath 来做到这一点,但这是一种没有 XPath 的方法。
function walk(DOMNode $node, $skipParent = false) {
if (!$skipParent) {
yield $node;
}
if ($node->hasChildNodes()) {
foreach ($node->childNodes as $n) {
yield from walk($n);
}
}
}
$html = <<<'HTML'
<span class="xxx">
Not this text
<span class="yyy">not this text</span>
<span class="zzz">This is</span>
the required text
<q class="aaa">this not</q>
</span>
HTML;
$dom = new DOMDocument;
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$count = 0;
foreach(walk($dom->firstChild) as $node) {
if (!($node instanceof DOMText) && $node->hasAttribute('class') && $node->getAttribute('class') === 'xxx') {
foreach(walk($node) as $n) {
if (isset($content)) {
$count++;
}
if (!($n instanceof DOMText) && $n->hasAttribute('class') && $n->getAttribute('class') === 'zzz') {
$content = $n->textContent;
}
if (isset($content) && $n instanceof DOMText && $count == 2) {
$content .= " " . $n->textContent;
break 2;
}
}
}
}
var_dump($content);
无论"the required text"
部分是否存在,这都会为您提供所需的结果。
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