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