The DOMDocument::registerNodeClass() function is an inbuilt function in PHP which is used to register extended class used to create base node type.
Syntax:
bool DOMDocument::registerNodeClass( string $baseclass,
string $extendedclass )
Parameters: This function accept two parameters as mentioned above and described below:
- $baseclass: It specifies the DOM class that you want to extend.
- $extendedclass: It specifies the extended class name.
Return Value: This function returns TRUE on success or FALSE on failure.
Below given programs illustrate the DOMDocument::registerNodeClass() function in PHP:
Program 1: In this program we will create a HTML div element with CSS properties using classes.
<?php   // Create a class myElement class myElement extends DOMElement {     // Create a custom function to     // append the element     public function appendElement($name)     {         return $this->appendChild(new myElement($name));     } }   // Create a class myDocoment class myDocument extends DOMDocument {       // Create a custom function to set the root     public function setRoot($name) {         return $this->appendChild(new myElement($name));     } }   // Create a instance of above class $doc = new myDocument();   // Register the node class $doc->registerNodeClass('DOMElement', 'myElement');   // Use setRoot created in myDocument class $root = $doc->setRoot('div');   // Use appendElement created in myElement $child = $root->appendElement('div');   // Set the attribute $child->setAttribute('style',     'background:blue; width:100px;height:100px');   echo $doc->saveXML(); ?> |
Output:
Program 2: In this program we will get the text content of a tag using classes.
<?php   class myElement extends DOMElement {       // Create a custom function to     // get the value of node     public function getData() {         return $this->nodeValue;     } }   // Create a new DOMDocument $doc = new DOMDocument;   // Load the XML $doc->loadXML( "<root><div><h1>This is my heading</h1></div></root>");   // Register the node class $doc->registerNodeClass("DOMElement", "myElement");   // Get the element $element = $doc->getElementsByTagName("h1")->item(0);   // Use the custom created getData() function echo $element->getData(); ?> |
Output:
This is my heading
Reference: https://www.php.net/manual/en/domdocument.registernodeclass.php
