PHP Manual: Changes the qualified name or namespace of an attribute

Description

public void Dom\Attr::rename(stringnull $namespaceURI, string $qualifiedName)

This method changes the qualified name or namespace of an attribute.

Parameters

namespaceURI: The new namespace URI of the attribute.
qualifiedName: The new qualified name of the attribute.

Return Values

No value is returned.

Errors/Exceptions

DOMException with code Dom\NAMESPACE_ERR: Raised if there is an error with the namespace, as determined by qualifiedName.
DOMException with code Dom\INVALID_MODIFICATION_ERR: Raised if there already exists an attribute in the element with the same qualified name.

Examples

Example #1 Dom\Attr::rename example to change both the namespace and qualified name

This changes the qualified name of my-attr to my-new-attr and also changes its namespace to urn:my-ns.

<?php

$doc = Dom\XMLDocument::createFromString('<root my-attr="value"/>');

$root = $doc->documentElement;
$attribute = $root->attributes['my-attr'];
$attribute->rename('urn:my-ns', 'my-new-attr');

echo $doc->saveXml();

?>

The above example will output:

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:ns1="urn:my-ns" ns1:my-new-attr="value"/>

Example #2 Dom\Attr::rename example to change only the qualified name

This only changes the qualified name of my-attr and keeps the namespace URI the same.

<?php

$doc = Dom\XMLDocument::createFromString('<root my-attr="value"/>');

$root = $doc->documentElement;
$attribute = $root->attributes['my-attr'];
$attribute->rename($attribute->namespaceURI, 'my-new-attr');

echo $doc->saveXml();

?>

The above example will output:

<?xml version="1.0" encoding="UTF-8"?>
<root my-new-attr="value"/>

Notes

Note: It is sometimes necessary to change the qualified name and namespace URI together in one step to not break any namespace rules.

Dom\Attr::rename