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DOMDocument::createAttribute

(PHP 5, PHP 7)

DOMDocument::createAttribute新しい属性を作成する

説明

public DOMAttr DOMDocument::createAttribute ( string $name )

この関数は、DOMAttr クラスの新しいインスタンスを作成します。 このノードは、( DOMNode::appendChild() などで) 挿入されない限り、ドキュメント内にあらわれません。

パラメータ

name

属性の名前。

返り値

新しい DOMAttr、あるいはエラーが発生した場合は FALSE を返します。

エラー / 例外

DOM_INVALID_CHARACTER_ERR

name が無効な文字を含んでいる場合に発生します。

参考

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User Contributed Notes 2 notes

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42
Beerkeeper
5 years ago
Just in case it isn't clear (like I had), an example:

<?php

$domDocument
= new DOMDocument('1.0', "UTF-8");
$domElement = $domDocument->createElement('field','some random data');
$domAttribute = $domDocument->createAttribute('name');

// Value for the created attribute
$domAttribute->value = 'attributevalue';

// Don't forget to append it to the element
$domElement->appendChild($domAttribute);

// Append it to the document itself
$domDocument->appendChild($domElement);

?>

Will output:
<?xml version="1.0" encoding="UTF-8"?>
<field name="attributevalue">some random data</field>
up
-5
Skateside
4 years ago
This may be obvious to most people, but it gave me a few minutes of head-scratching before I figured it out, but ampersands need to be properly escaped as HTML entities.

<?php
$doc
= new DOMDocument('1.0', "UTF-8");

$invalid_elem = $doc->createElement('field', 'incorrect attribute');
$invalid_attr = $doc->createAttribute('name');
$invalid_attr->value = 'foo&bar';
$invalid_elem->appendChild($invalid_attr);
$doc->appendChild($invalid_elem);

$valid_elem = $doc->createElement('field', 'correct attribute');
$valid_attr = $doc->createAttribute('name');
$valid_attr->value = 'foo&amp;bar';
$valid_elem->appendChild($valid_attr);
$doc->appendChild($valid_elem);

?>

Will output:
<?xml version="1.0" encoding="UTF-8"?>
<field name="foo">incorrect attribute</field>
<field name="foo&bar">correct attribute</field>

As near as I can figure out, no exception is thrown for an invalid attribute. This will affect DOMDocuments created as HTML as well as XML.
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