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PHP | DOMElement getElementsByTagNameNS() Function

  • Last Updated : 05 Mar, 2020
Geek Week

The DOMElement::getElementsByTagNameNS() function is an inbuilt function in PHP which is used to get all the descendant elements with a given localName and namespaceURI.

Syntax:

DOMNodeList DOMElement::getElementsByTagNameNS( 
          string $namespaceURI, string $localName )

Parameters: This function accept two parameters as mentioned above and described below:

  • $namespaceURI: It specifies the namespace URI.
  • $localName: It specifies the local name.

Return Value: This function returns a DOMNodeList value containing all matched elements in the order in which they are encountered in a preorder traversal of this element tree.

Below given programs illustrate the DOMElement::getElementsByTagNameNS() function in PHP:



Program 1:




<?php
// Create a new DOMDocument
$dom = new DOMDocument();
   
// Load the XML
$dom->loadXML("<?xml version=\"1.0\"?>
<root>
    <div xmlns:x=\"my_namespace\">
        <x:h1 x:style=\"color:red;\">
            Hello, this is my red heading.
        </x:h1>
        <x:h1 x:style=\"color:green;\">
            Hello, this is my green heading.
        </x:h1>
        <x:h1 x:style=\"color:blue;\">
            Hello, this is my blue heading.
        </x:h1>
    </div>
    <div xmlns:y=\"another_namespace\">
        <y:h1 y:style=\"color:red;\">
            Hello, this is my new red heading.
        </y:h1>
        <y:h1 y:style=\"color:green;\">
            Hello, this is my new green heading.
        </y:h1>
        <y:h1 y:style=\"color:blue;\">
            Hello, this is my new blue heading.
        </y:h1>
    </div>
</root>");
   
// Get the elements with h1 tag from
// specific namespace
$nodeList = $dom->getElementsByTagNameNS(
                    'my_namespace', 'h1');
  
foreach ($nodeList as $node) {
    echo $node->getAttribute('x:style') . '<br>';
}
?>

Output:

color:red;
color:green;
color:blue;

Program 2:




<?php
  
// Create a new DOMDocument
$dom = new DOMDocument();
   
// Load the XML
$dom->loadXML("<?xml version=\"1.0\"?>
<root>
    <div xmlns:x=\"my_namespace\">
        <x:p>HELLO.</x:p>
        <x:p>NEW.</x:p>
        <x:p>WORLD.</x:p>
    </div>
    <div xmlns:y=\"g4g_namespace\">
        <y:p>GEEKS</y:p>
        <y:p>FOR</y:p>
        <y:p>GEEKS</y:p>
    </div>
</root>");
   
// Get the elements
$nodeList = $dom->getElementsByTagNameNS(
                    'g4g_namespace', 'p');
  
foreach ($nodeList as $node) {
    echo $node->textContent . '<br>';
}
?>

Output:

GEEKS
FOR
GEEKS

Reference: https://www.php.net/manual/en/domelement.getelementsbytagnamens.php




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