DOMDocument::getElementsByTagNameNS

(PHP 5, PHP 7, PHP 8)

DOMDocument::getElementsByTagNameNS — Searches for all elements with given tag name in specified namespace

Description ¶

public DOMDocument::getElementsByTagNameNS(?string $namespace, string $localName): DOMNodeList

Returns a DOMNodeList of all elements with a given local name and a namespace URI.

Parameters ¶

namespace: The namespace URI of the elements to match on. The special value "*" matches all namespaces. Passing null matches the empty namespace.
localName: The local name of the elements to match on. The special value "*" matches all local names.

Return Values ¶

A new DOMNodeList object containing all the matched elements.

Changelog ¶

Version	Description
8.0.3	`namespace` is nullable now.

Examples ¶

Example #1 Get all the XInclude elements

<?php

$xml = <<<EOD
<?xml version="1.0" ?>
<chapter xmlns:xi="http://www.w3.org/2001/XInclude">
<title>Books of the other guy..</title>
<para>
 <xi:include href="book.xml">
  <xi:fallback>
   <error>xinclude: book.xml not found</error>
  </xi:fallback>
 </xi:include>
 <include>
  This is another namespace
 </include>
</para>
</chapter>
EOD;
$dom = new DOMDocument;

// load the XML string defined above
$dom->loadXML($xml);

foreach ($dom->getElementsByTagNameNS('http://www.w3.org/2001/XInclude', '*') as $element) {
    echo 'local name: ', $element->localName, ', prefix: ', $element->prefix, "\n";
}
?>

The above example will output:

local name: include, prefix: xi
local name: fallback, prefix: xi

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User Contributed Notes 1 note

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RiKdnUA at mail dot ru ¶

10 years ago

<?php
ini_set("display_errors","on"); error_reporting(-1);
$doc="<?xml version='1.0' encoding='WINDOWS-1251'?>
<htm:body xmlns:htm='w3.org'>
<span>Text</span>
<htm:img htm:src='imgSrc'/>
</htm:body>";
$dom = new DOMDocument('1.0','WINDOWS-1251');
$dom->preserveWhiteSpace=false;
$dom->loadXML($doc);
$domList=$dom->getElementsByTagNameNS('*','*');//all namespaces, all local names
echo "Количество элементов. The number of elements: ".$domList->length."<br />";// 2 (not 3)
for ($i=0; $i<$domList->length; $i++)
{echo "Элемент $i. The element $i: ".$domList->item($i)->tagName."<br />";
}
/*
Tested in PHP 5.2.9-2 and 5.2.17
The above example will output: 
Количество элементов. The number of elements: 2
Элемент 0. The element 0: htm:body
Элемент 1. The element 1: htm:img

Вывод. Не найден элемент span
Conclusion. Not found span element
*/
?>