PHP | DOMElement hasAttributeNS() Function

<?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> Hello, this is my new red heading. </y:h1>
        <y:h1> Hello, this is my new green heading. </y:h1>
        <y:h1> Hello, this is my new blue heading. </y:h1>
    </div>
</root>");
 
// Get the elements
$nodeList = $dom->getElementsByTagName('h1');
 
$i = 0;
 
foreach ($nodeList as $node) {
    if($node->hasAttributeNS('my_namespace', 'style')) {
        $i++;
    }
}
echo "Yes, there are total of $i style 
               attributes inside my_namespace";
?>

<?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:id=\"color:red;\"> 1 </x:h1>
        <x:h1 x:id=\"color:green;\"> 2 </x:h1>
        <x:h1 x:id=\"color:blue;\"> 3 </x:h1>
    </div>
    <div xmlns:y=\"another_namespace\">
        <y:h1> 1 </y:h1>
        <y:h1> 2 </y:h1>
        <y:h1> 3 </y:h1>
    </div>
</root>");

// Get the elements
$nodeList = $dom->getElementsByTagName('h1');

$i = 0;

foreach ($nodeList as $node) {
    if($node->hasAttributeNS('another_namespace', 'id')) {
        $i++;
    }
}
echo "There are total of $i id attributes
                         inside another_namespace.";
?>