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    DOMDocument::registerNodeClass

    (PHP 5 >= 5.2.0, PHP 7)

    DOMDocument::registerNodeClass — Register extended class used to create base node type

    Descrierea

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

    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.

    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.

    Valorile întoarse

    Întoarce valoarea true în cazul succesului sau false în cazul eșecului.

    Exemple

    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();

    ?>

    Exemplul de mai sus va afișa:

    <?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;
    ?>

    Exemplul de mai sus va afișa:

    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));
    ?>

    Exemplul de mai sus va afișa:

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

    Example #4 Custom objects are transient

    Precauţie

    Objects of the registered node classes are transient, i.e. they are destroyed when they are no longer referenced from PHP code, and recreated when being retrieved again. That implies that custom property values will be lost after recreation.

    <?php
    class MyDOMElement extends DOMElement
    {
        public     $myProp = 'default value';
    }

    $doc = new DOMDocument();
    $doc->registerNodeClass('DOMElement', 'MyDOMElement');

    $node = $doc->createElement('a');
    $node->myProp = 'modified value';
    $doc->appendChild($node);

    echo     $doc->childNodes[0]->myProp, PHP_EOL;
    unset(    $node);
    echo     $doc->childNodes[0]->myProp, PHP_EOL;
    ?>

    Exemplul de mai sus va afișa:

    modified value
default value

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    User Contributed Notes 2 notes

    up
    4
    crh3675 at gmail dot com
    15 years ago
    Creating innerHTML and outerHTML

    <?php

    class DOMHTMLElement extends DOMElement
    {
        function     __construct() { parent::__construct();}
       
        public function     innerHTML()
        {
                $doc = new DOMDocument();
          foreach (    $this->childNodes as $child){
                  $doc->appendChild($doc->importNode($child, true));
            }
                $content = $doc->saveHTML();
            return     $content;
        }
       
        public function     outerHTML()
        {
                $doc = new DOMDocument();
                $doc->appendChild($doc->importNode($this, true));
                $content = $doc->saveHTML();
            return     $content;
        }
    }

    $dom = DOMDocument::loadHTMLFile($file);
    $dom->registerNodeClass('DOMElement','DOMHTMLElement');
               
    if(    $dom)
    {
            $xpath = new DOMXpath($dom);   
            $regions = $xpath->query("//*[contains(@class, 'editable')]");   
            $content = '';
       
        foreach(    $regions as $region){
                $content .= $region->outerHTML();
        }   
       
        return     $content;
       
    }else{               
        throw new     Exception('Cannot parse HTML.  Please verify the syntax is correct.');
    }
    ?>
    up
    1
    arnold at adaniels dot nl
    15 years ago
    Note than save and saveXML are not affected by __toString().
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