PHP | DOMProcessingInstruction __construct() Function

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The DOMProcessingInstruction::__construct() function is an inbuilt function in PHP which is used a new read-only DOMProcessingInstruction object. To create a writable node, use DOMDocument::createProcessingInstruction.
Syntax:

public DOMProcessingInstruction::__construct( string $name, string $value )

Parameters: This function accept two parameters as mentioned above and described below:

$name: It specifies the tag name of the processing instruction.
$value: It specifies the value of the processing instruction.

Below given programs illustrate the DOMProcessingInstruction::__construct() function in PHP:
Program 1: Press Ctrl+U to see the DOM

php

<?php
 
// Create a new DOMDocument instance
$dom = new DOMDocument();
 
// Create a html element
$html = $dom->appendChild(new DOMElement('html'));
 
// Create a body element
$body = $html->appendChild(new DOMElement('body'));
 
// Create a new DOMProcessingInstruction node
$pinode = new DOMProcessingInstruction('php',
          'echo "zambiatek"; ');
 
// Append the child
$body->appendChild($pinode);
 
// Render the XML
echo $dom->saveXML();
?>

Output:

Program 2: Press Ctrl+U to see the DOM element.

php

<?php
 
// Create a new DOMDocument instance
$dom = new DOMDocument();
 
// Create a html element
$html = $dom->appendChild(new DOMElement('html'));
 
// Create a body element
$body = $html->appendChild(new DOMElement('body'));
 
// Create a new DOMProcessingInstruction node
$pinode = new DOMProcessingInstruction('xml-stylesheet',
       'type="text/xsl" href="base.xsl"');
 
// Append the child
$body->appendChild($pinode);
 
// Render the XML
echo $dom->saveXML();
?>