The DOMXPath::registerNamespace() function is an inbuilt function in PHP which is used to register the namespaceURI and prefix with the DOMXPath object.
Syntax:
php
Output:
php
Output:
bool DOMXPath::registerNamespace( string $prefix,
string $namespaceURI )
Parameters: This function accepts two parameters as mentioned above and described below:
- $prefix: It specifies the prefix.
- $namespaceURI: It specifies the namespace URI.
<?php
// Create a new DOMDocument instance
$document = new DOMDocument();
// Create a XML
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<body xmlns="geeksforgeeks" >
<h1>Hello</h1>
</body>
XML;
// Load the XML
$document->loadXML($xml);
// Create a new DOMXPath instance
$xpath = new DOMXPath($document);
// Register namespace with prefix
// x and wrong URI
$xpath->registerNamespace('x',
'geeksforgeeksnew');
// Use the prefix to create a query
// to get the text in h1
$query = '//x:body/x:h1/text()';
// Execute the query
$entries = $xpath->evaluate($query);
// Count the output
echo count($entries) . "\n";
?>
0Program 2:
<?php
// Create a new DOMDocument instance
$document = new DOMDocument();
// Create a XML
$xml = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<body xmlns="geeksforgeeks" >
<h1>Hello</h1>
</body>
XML;
// Load the XML
$document->loadXML($xml);
// Create a new DOMXPath instance
$xpath = new DOMXPath($document);
// Register namespace with prefix x
$xpath->registerNamespace('x',
'geeksforgeeks');
// Use the prefix to create a query
// to get the text in h1
$query = '//x:body/x:h1/text()';
// Execute the query
$entries = $xpath->evaluate($query);
// View the text
echo $entries->item(0)->nodeValue . "\n";
?>
HelloReference: https://www.php.net/manual/en/domxpath.registernamespace.php
