DOMDocument::normalizeDocumentDOMDocument::registerNodeClass
(PHP 5 >= 5.2.0)
DOMDocument::registerNodeClass — Register extended class used to create base node type
Beschreibung
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.
Parameter-Liste
- baseclass
-
The DOM class that you want to extend. You can find a list of these classes in the chapter introduction.
Of course, you won't be able to register a class extending DOMDocument but you can always start your document by instanciating your own extending class.
- extendedclass
-
Your extended class name. If NULL is provided, any previously registered class extending baseclass will be removed.
Rückgabewerte
Gibt bei Erfolg TRUE zurück, im Fehlerfall FALSE.
ChangeLog
| Version | Beschreibung |
|---|---|
| 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 . |
Beispiele
Beispiel #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();
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
<?xml version="1.0"?> <root><child foo="bar"/></root>
Beispiel #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;
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
string(9) "myElement" text in child
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User Contributed NotesDOMDocument::registerNodeClass