DOMDocument
PHP Manual

DOMDocument::registerNodeClass

(PHP 5 >= 5.2.0)

DOMDocument::registerNodeClassRegister extended class used to create base node type

Descrizione

bool DOMDocument::registerNodeClass ( string $baseclass , string $extendedclass )

This method allows you to register your own extended DOM class to be used afterward by the PHP DOM extension.

This method is not part of the DOM standard.

Elenco dei parametri

baseclass

The DOM class that you want to extend. You can find a list of these classes in the chapter introduction.

extendedclass

Your extended class name. If NULL is provided, any previously registered class extending baseclass will be removed.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Log delle modifiche

Versione Descrizione
PHP 5.2.2 Prior to 5.2.2, a previously registered extendedclass had to be unregistered before being able to register a new class extending the same baseclass.

Esempi

Example #1 Adding a new method to DOMElement to ease our code

<?php

class myElement extends DOMElement {
   function 
appendElement($name) { 
      return 
$this->appendChild(new myElement($name));
   }
}

class 
myDocument extends DOMDocument {
   function 
setRoot($name) { 
      return 
$this->appendChild(new myElement($name));
   }
}

$doc = new myDocument();
$doc->registerNodeClass('DOMElement''myElement');

// From now on, adding an element to another costs only one method call ! 
$root $doc->setRoot('root');
$child $root->appendElement('child');
$child->setAttribute('foo''bar');

echo 
$doc->saveXML();

?>

Il precedente esempio visualizzerĂ :

<?xml version="1.0"?>
<root><child foo="bar"/></root>

Example #2 Retrieving elements as custom class

<?php
class myElement extends DOMElement {
    public function 
__toString() {
        return 
$this->nodeValue;
    }
}

$doc = new DOMDocument;
$doc->loadXML("<root><element><child>text in child</child></element></root>");
$doc->registerNodeClass("DOMElement""myElement");

$element $doc->getElementsByTagName("child")->item(0);
var_dump(get_class($element));

// And take advantage of the __toString method..
echo $element;
?>

Il precedente esempio visualizzerĂ :

string(9) "myElement"
text in child

Example #3 Retrieving owner document

When instantiating a custom DOMDocument the ownerDocument property will refer to the instantiated class, meaning there is no need (and in fact not possible) to use DOMDocument::registerNodeClass() with DOMDocument

<?php
class myDOMDocument extends DOMDocument {
}

class 
myOtherDOMDocument extends DOMDocument {
}

// Create myDOMDocument with some XML
$doc = new myDOMDocument;
$doc->loadXML("<root><element><child>text in child</child></element></root>");

$child $doc->getElementsByTagName("child")->item(0);

// The current owner of the node is myDOMDocument
var_dump(get_class($child->ownerDocument));

// Import a node from myDOMDocument
$newdoc = new myOtherDOMDocument;
$child $newdoc->importNode($child);

// The new owner of the node has changed to myOtherDOMDocument
var_dump(get_class($child->ownerDocument));
?>

Il precedente esempio visualizzerĂ :

string(13) "myDOMDocument"
string(18) "myOtherDOMDocument"


DOMDocument
PHP Manual