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This document uses PHP Chinese website manual Release
(PHP 5, PHP 7)
DOMDocument::createAttribute — Create new attribute
$name
)This function creates a new instance of class DOMAttr. 此节点出现在文档中,除非是用诸如 DOMNode->appendChild() 等函数来将其插入。
name
The name of the attribute.
The new DOMAttr or FALSE
if an error occurred.
DOM_INVALID_CHARACTER_ERR
Raised if name
contains an invalid character.
[#1] Skateside [2013-04-05 16:16:57]
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&bar';
$valid_elem->appendChild($valid_attr);
$doc->appendChild($valid_elem);
?>
Will output:
<?phpxml 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.
[#2] Beerkeeper [2011-11-09 07:19:48]
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:
<?phpxml version="1.0" encoding="UTF-8"?>
<field name="attributevalue">some random data</field>