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PHP | DOMXPath __construct() Function

  • Last Updated : 17 Mar, 2020

The DOMXPath::__construct() function is an inbuilt function in PHP which is used to create an instance of DOMXPath.

Syntax:

bool DOMXPath::__construct( DOMDocument $doc )

Parameters: This function accepts a single parameter $doc which holds the DOMDocument associated with the DOMXPath.

Below examples illustrate the DOMXPath::__construct() function in PHP:

Example 1:






<?php
  
// Create a new DOMDocument instance
$document = new DOMDocument();
  
// Create a XML
$xml = <<<XML
<?xml version="1.0" encoding="utf-8"?>
<content>
  Hello World
</content>
XML;
  
// Load the XML
$document->loadXML($xml);
  
// Create a new DOMXPath instance
$xpath = new DOMXPath($document);
  
// Get the element
$tbody = $document->
getElementsByTagName('content')->item(0);
  
// Get the element with name content
$query = '//content';
  
// Evaluate the query
$entries = $xpath->evaluate($query, $tbody);
echo $entries[0]->nodeValue;
?>

Output:

Hello World

Example 2:




<?php
  
// Create a new DOMDocument instance
$document = new DOMDocument();
  
// Create a XML
$xml = <<<XML
<?xml version="1.0" encoding="utf-8"?>
<root>
    <content>
        First
    </content>
    <content>
        Second
    </content>
    <content>
        Third
    </content>
</root>
XML;
  
// Load the XML
$document->loadXML($xml);
  
// Create a new DOMXPath instance
$xpath = new DOMXPath($document);
  
// Get the root element
$tbody = $document->
getElementsByTagName('root')->item(0);
  
// Count the number of element with 
// name content
$query = 'count(//content)';
  
// Evaluate the query
$entries = $xpath->evaluate($query, $tbody);
echo $entries;
?>

Output:

3

Reference: https://www.php.net/manual/en/domxpath.construct.php




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