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