DOMDocument::prepend

(PHP 8)

DOMDocument::prepend — Prepends nodes before the first child node

public DOMDocument::prepend(DOMNode|string ...$nodes): void

Prepends one or many nodes to the list of children before the first child node.

nodes: The 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.

版本	说明
8.3.0	Calling this method on a node without an owner document now works. Previously this threw a DOMException with code `DOM_HIERARCHY_REQUEST_ERR`.

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/>