(PHP 8 >= 8.3.0)
DOMElement::insertAdjacentElement — Insert adjacent element
Inserts an element at a relative position given by where.
where
beforebegin - Insert before the target element.afterbegin - Insert as the first child of the target element.beforeend - Insert as the last child of the target element.afterend - Insert after the target element.elementThe element to insert.
Return DOMElement or null on failure.
示例 #1 DOMElement::insertAdjacentElement() example
<?php
$dom = new DOMDocument();
$dom->loadXML('<?xml version="1.0"?><container><p>foo</p></container>');
$container = $dom->documentElement;
$p = $container->firstElementChild;
$p->insertAdjacentElement('beforebegin', $dom->createElement('A'));
echo $dom->saveXML();
?>以上示例会输出：
<?xml version="1.0"?> <container><A/><p>foo</p></container>