# DOMElement::prepend

(PHP 8)

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

### 说明

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

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

### 参数

`nodes`

  The nodes to prepend. Strings are automatically converted to text nodes.

### 返回值

没有返回值。

### 错误／异常

`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.

### 更新日志

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

示例 #1 DOMElement::prepend() example

Prepends nodes in the container element.

`<?php
$doc = new DOMDocument;
$doc->loadXML("<container> world</container>");
$world = $doc->documentElement;
$world->prepend($doc->createElement("hello"), "beautiful");
echo $doc->saveXML();
?>`

以上示例会输出：

    <?xml version="1.0"?>
    <container><hello/>beautiful world</container>

### 参见

- DOMParentNode::prepend() - Prepends nodes before the first child node
- DOMElement::append() - Appends nodes after the last child node

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