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PHP | DOMNode isDefaultNamespace() Function

Last Updated : 27 Feb, 2020
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The DOMNode::isDefaultNamespace() function is an inbuilt function in PHP which is used to check if the specified namespaceURI is the default namespace or not. Syntax: 
bool DOMNode::isDefaultNamespace( string $namespaceURI )
Parameters: This function accepts a single parameter $namespaceURI which holds the namespace URI. Return Value: This function return TRUE if namespaceURI is the default namespace, FALSE otherwise. Below examples illustrate the DOMNode::isDefaultNamespace() function in PHP: Example 1: php 
<?php
 
// Create a new DOMDocument
$dom = new DOMDocument();
 
// Create a paragraph element with a namespace
$p_element = $dom->createElementNS(
    'my_namespace', 'p', 'GeeksforGeeks');
 
// Append the child to DOMDocument
$dom->appendChild($p_element);
 
// Check if the namespace is default or not
if($dom->isDefaultNamespace('my_namespace')) {
    echo 'Yes, my_namespace is the default namespace.';
}
?>
Output: 
Yes, my_namespace is the default namespace.
Example 2: php 
<?php

// Create a new DOMDocument
$dom = new DOMDocument();
 
// Create a paragraph element with a namespace
$p_element = $dom->createElementNS(
    'my_namespace', 'p', 'GeeksforGeeks');
 
// Append the child to DOMDocument
$dom->appendChild($p_element);
 
// Check if the namespace is default or not
if(!$dom->isDefaultNamespace('some_other_namespace'))
{
    echo 'No, some_other_namespace is not'
                         . ' default namespace.';
}
?>
Output: 
No, some_other_namespace is not the default namespace.
Reference: https://www.php.net/manual/en/domnode.isdefaultnamespace.php

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