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