[edit] Last updated: Fri, 25 May 2012

DOMElement::hasAttributeNS

(PHP 5)

DOMElement::hasAttributeNS — Checks to see if attribute exists

说明

bool DOMElement::hasAttributeNS ( string $namespaceURI , string $localName )

Indicates whether attribute in namespace namespaceURI named localName exists as a member of the element.

参数

namespaceURI: The namespace URI.
localName: The local name.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE.

参见

DOMElement::hasAttribute() - Checks to see if attribute exists
DOMElement::getAttributeNS() - Returns value of attribute
DOMElement::setAttributeNS() - Adds new attribute
DOMElement::removeAttributeNS() - Removes attribute

add a note User Contributed Notes DOMElement::hasAttributeNS

chad dot retz at gmail dot com 10-May-2008 06:38


This does not work as expected (at least on 5.2.5) with attributes in the default namespace. For instance:



<?php

$dom = new DOMDocument();

$dom->loadXML('<?xml version="1.0"?><element xmlns="testns" attr="testval" />');

var_dump($dom->documentElement->hasAttributeNS('testns', 'attr'));

?>



returns bool(false) whereas:



<?php

$dom = new DOMDocument();

$dom->loadXML('<?xml version="1.0"?><element xmlns:ns1="testns" ns1:attr="testval" />');

var_dump($dom->documentElement->hasAttributeNS('testns', 'attr'));

?>



returns bool(true). NULL does work properly in the namespaceURI parameter, so changing my initial example to:



<?php

$dom = new DOMDocument();

$dom->loadXML('<?xml version="1.0"?><element xmlns="testns" attr="testval" />');

var_dump($dom->documentElement->hasAttributeNS(NULL, 'attr'));

?>



returns bool(true) as expected. Or even better for when you don't know whether the NS will be default:



<?php

$dom = new DOMDocument();

$dom->loadXML('<?xml version="1.0"?><element xmlns="testns" attr="testval" />');

var_dump($dom->documentElement->hasAttributeNS(

    is_null($dom->documentElement->lookupPrefix('testns')) ? NULL : 'testns', 'attr'));

?>

add a note