The DOMElement::hasAttributeNS() function is an inbuilt function in PHP which is used to know whether attribute in specific namespace named localName exists as a member of the element or not.
Syntax:
bool DOMElement::hasAttributeNS( string $namespaceURI, string $localName )
Parameters: This function accepts 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 TRUE on success or FALSE on failure.
Below examples illustrate the DOMElement::hasAttributeNS() function in PHP:
Example 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> 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"; ?> |
Output:
Yes, there are total of 3 style attributes inside my_namespace.
Example 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: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."; ?> |
Output:
There are total of 0 id attributes inside another_namespace.
Reference: https://www.php.net/manual/en/domelement.hasattributens.php
