PHP | DOMDocument registerNodeClass() Function

0 0 1 minute read

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(); 
?> 