(PHP 8)
DOMDocument::prepend — Prepends nodes before the first child node
Prepends one or many nodes to the list of children before the first child node.
nodesThe nodes to prepend. Strings are automatically converted to text nodes.
没有返回值。
DOM_HIERARCHY_REQUEST_ERR
Raised if this node is of a type that does not allow children of the
type of one of the passed nodes, or if the node to
put in is one of this node's ancestors or this node itself.
DOM_WRONG_DOCUMENT_ERR
Raised if one of the passed nodes was created from a different
document than the one that created this node.
示例 #1 DOMDocument::prepend() example
Adds nodes before the document root.
<?php
$doc = new DOMDocument;
$doc->loadXML("<world/>");
$doc->prepend($doc->createElement("hello"), "beautiful");
echo $doc->saveXML();
?>以上示例会输出：
<?xml version="1.0"?> <hello/> beautiful <world/>