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PHP | XMLReader lookupNamespace() Function

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The XMLReader::lookupNamespace() function is an inbuilt function in PHP which is used to lookup in scope namespace for a given prefix. Syntax:
string XMLReader::lookupNamespace( string $prefix )
Parameters: This function accepts a single parameter $prefix which holds the string containing the prefix. Return Value: This function returns TRUE on success or FALSE on failure. Below given programs illustrate the XMLReader::lookupNamespace() function in PHP: Program 1: Filename: data.xml
<?xml version="1.0" encoding="utf-8"?>
<div xmlns:z="my_namespace">
    <z:h1 z:attrib="value"> Foo Bar </z:h1>
</div>

                    
Filename: index.php
<?php
  
// Create a new XMLReader instance
$XMLReader = new XMLReader();
  
// Open the XML file
$XMLReader->open('data.xml');
  
// Read the node
$XMLReader->read();
  
// Get the namespace with prefix y
$NS = $XMLReader->lookupNamespace("y");
  
// Show the namespace to browser
echo $NS;
?>

                    
Output:
// Empty string because there is no namespace with prefix y.
Program 2: Filename: data.xml
<?xml version="1.0" encoding="utf-8"?>
<div xmlns:x="geeksforgeeks">
    <x:h1 x:attrib="value"> Namespaced Text </x:h1>
</div>

                    
Filename: index.php
<?php
  
// Create a new XMLReader instance
$XMLReader = new XMLReader();
  
// Open the XML file
$XMLReader->open('data.xml');
  
// Read the node
$XMLReader->read();
  
// Get the namespace with prefix x
$NS = $XMLReader->lookupNamespace("x");
  
// Show the namespace to browser
echo $NS;
?>

                    
Output:
geeksforgeeks
Reference: https://www.php.net/manual/en/xmlreader.lookupnamespace.php

Last Updated : 26 Mar, 2020
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