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DOMDocument::registerNodeClass
(PHP 5 >= 5.2.0, PHP 7)
DOMDocument::registerNodeClass — Register extended class used to create base node type
Description
$baseclass
, string $extendedclass
) : boolThis method allows you to register your own extended DOM class to be used afterward by the PHP DOM extension.
This method is not part of the DOM standard.
Parameters
-
baseclass -
The DOM class that you want to extend. You can find a list of these classes in the chapter introduction.
-
extendedclass -
Your extended class name. If
NULLis provided, any previously registered class extendingbaseclasswill be removed.
Changelog
| Version | Description |
|---|---|
| 5.2.2 |
Prior to 5.2.2, a previously registered extendedclass
had to be unregistered before being able to register a new class extending
the same baseclass.
|
Examples
Example #1 Adding a new method to DOMElement to ease our code
<?php
class myElement extends DOMElement {
function appendElement($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();
?>
The above example will output:
<?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;
?>
The above example will output:
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));
?>
The above example will output:
string(13) "myDOMDocument" string(18) "myOtherDOMDocument"
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-domdocument.registernodeclass.html
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References
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