SunshinePHP Developer Conference 2015

DOMDocument::registerNodeClass

(PHP 5 >= 5.2.0)

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

说明

public 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.

参数

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.

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE

更新日志

版本 说明
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.

范例

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();

?>

以上例程会输出:

<?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;
?>

以上例程会输出:

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));
?>

以上例程会输出:

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

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User Contributed Notes 2 notes

up
1
crh3675 at gmail dot com
5 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
0
arnold at adaniels dot nl
5 years ago
Note than save and saveXML are not affected by __toString().
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