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DOMElement::before

(PHP 8)

DOMElement::beforeAdds nodes before the element

说明

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

Adds the passed nodes before the element.

参数

nodes

Nodes to be added before the node. 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 the parent 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 a parent is now a no-op to align the behaviour with the DOM specification. Previously this threw a DOMException with code DOM_HIERARCHY_REQUEST_ERR.

示例

示例 #1 DOMElement::before() example

Adds nodes before the hello element.

<?php
$doc
= new DOMDocument;
$doc->loadXML("<world/>");
$world = $doc->documentElement;

$world->before("hello", $doc->createElement("beautiful"));

echo
$doc->saveXML();
?>

以上示例会输出:

hello
<beautiful/>
<world/>

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