PHP | DOMXPath __construct() Function
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
