The DOMComment::__construct() function is an inbuilt function in PHP which creates a new DOMComment object. This object is read only and can be appended to a document
Syntax:
public DOMComment::__construct( string $value)
Parameters: This function accepts a single parameter $value which holds the comment.
Below given programs illustrate the DOMComment::__construct() function in PHP:
Program 1 (Simple comment):
<?php   // Create a new DOM Document $dom = new DOMDocument('1.0', 'iso-8859-1');   // Create a h1 element $element = $dom->appendChild(new DOMElement('h1'));   // Create a DOMComment $comment = $element->appendChild(         new DOMComment('This line is a comment'));   echo $dom->saveXML(); ?> |
Output:
<?xml version="1.0" encoding="iso-8859-1"?> <h1><!--This line is a comment--></h1>
Program 2 (Using comments with elements):
<?php   // Create a new DOM Document $dom = new DOMDocument('1.0', 'iso-8859-1');   // Create a h1 element $element = $dom->appendChild(new DOMElement('h1'));   // Create a DOMCdataSection $comment = $element->appendChild(new DOMComment(         'This line is a comment about content'));   // Create a div element $element = $element->appendChild(new DOMElement(           'div', 'This is the actual content'));   echo $dom->saveXML(); ?> |
Output:
<?xml version="1.0" encoding="iso-8859-1"?> <h1><!--This line is a comment about content--> <div>This is the actual content</div></h1>
Reference: https://www.php.net/manual/en/domcomment.construct.php
