Very useful to add a CDATA node with SimpleXMLElement (use it like addChild) :

<?php
class My_SimpleXMLElement extends SimpleXMLElement {
    
    public function addChildWithCData($name, $value = NULL) {
        $new_child = $this->addChild($name);
        
        $node = dom_import_simplexml($new_child); 
        $no = $node->ownerDocument; 
        $node->appendChild($no->createCDATASection($value)); 
    
        return $new_child;
    }
}