我真的很难理解DOMDocument
解析。我正在尝试解决以下问题。给定以下HTML
<h1>Title</h1>
<p>Some Content</p>
<p>Some More Content</p>
<p>Other Content</p>
<p>Last Bit of Content</p>
我想在第二个段落标签之后添加一个div。本质上,结果需要像下面这样
<h1>Title</h1>
<p>Some Content</p>
<p>Some More Content</p>
<div>Something different</div> <!-- new tag -->
<p>Other Content</p>
<p>Last Bit of Content</p>
看了这里的一些帖子,我现在已经厌倦了抓耳挠脑。
您需要使用DOMDocument
类将字符串解析为html。解析html后,选择第三个p
元素,并使用DOMNode::insertBefore
在其后面插入新元素。
$doc = new DOMDocument();
$doc->loadHTML($html);
// find 3th p tag
$p = $doc->getElementsByTagName("p")->item(2);
// create new div tag
$div = $doc->createElement("div", "Something different");
// insert created element after 3th p
$p->parentNode->insertBefore($div, $p);
$html = $doc->saveHTML();
作为@Mohammad answer的补充(这是完全正确的),如果您想精确地找到h1标记之后的第二个p标记,并且在同一级别,您可以使用XPath查询//h1/following-sibling::p[2]
。例子:
$html = <<<'EOD'
<h1>Title</h1>
<p>Some Content</p>
<p>Some More Content</p>
<p>Other Content</p>
<p>Last Bit of Content</p>
EOD;
libxml_use_internal_errors(true);
$dom = new DOMDocument;
$dom->loadHTML('<div>' . $html . '</div>', LIBXML_HTML_NOIMPLIED);
libxml_clear_errors();
$xp = new DOMXPath($dom);
$targetNode = $xp->query('//h1/following-sibling::p[2]');
if ($targetNode->length) {
$targetNode = $targetNode->item(0);
$newNode = $dom->createElement('div', 'something different');
$targetNode->parentNode->insertBefore($newNode, $targetNode->nextSibling);
$targetNode->parentNode->insertBefore($dom->createTextNode("'n"), $targetNode->nextSibling);
}
$result = '';
foreach ($dom->documentElement->childNodes as $childNode) {
$result .= $dom->saveHTML($childNode);
}
echo $result;