PHP | XMLReader getAttributeNo() Function

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The XMLReader::getAttributeNo() function is an inbuilt function in PHP which is used to get the value of an attribute based on its position or an empty string if attribute does not exist or not positioned on an element node.

Syntax:

string XMLReader::getAttributeNo( int $index )

Parameters: This function accepts a single parameter $index which holds the index of the attribute value to fetch.

Return Value: This function returns value of the attribute on success or an empty string.

Below examples illustrate the XMLReader::getAttributeNo() function in PHP:

Example 1:

data.xml
<?xml version="1.0" encoding="utf-8"?>

<body>

<h1> Hello </h1>

</body>

index.php

<?php 
  
// Create a new XMLReader instance 
$XMLReader = new XMLReader(); 
  
// Load the XML file 
$XMLReader->open('data.xml'); 
  
// Iterate through the XML 
while ($XMLReader->read()) { 
    if ($XMLReader->nodeType == XMLREADER::ELEMENT) { 
  
        // Get the value of first attribute 
        $value = $XMLReader->getAttributeNo(0); 
  
        // Output the value to browser 
        echo $value . "<br>"; 
    } 
} 
?> 

Output:

// Empty string because no attributes are there in XML

Example 2:

data.xml
<?xml version="1.0" encoding="utf-8"?>

<body>

<h1 id="zambiatek"> Hello </h1>

<h2 id="my_id"> World </h2>

</body>

index.php

<?php 
  
// Create a new XMLReader instance 
$XMLReader = new XMLReader(); 
  
// Load the XML file 
$XMLReader->open('data.xml'); 
  
// Iterate through the XML 
while ($XMLReader->read()) { 
    if ($XMLReader->nodeType == XMLREADER::ELEMENT) { 
  
        // Get the value of first attribute 
        $value = $XMLReader->getAttributeNo(0); 
  
        // Output the value to browser 
        echo $value . "<br>"; 
    } 
} 
?> 

Output:
```
zambiatek
my_id
```

Reference: https://www.php.net/manual/en/xmlreader.getattributeno.php

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