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The DOMDocumentFragment class

(PHP 5, PHP 7)

类摘要

DOMDocumentFragment extends DOMNode {

/* 属性 */

/* 继承的属性 */

public readonly string $nodeName ;

public string $nodeValue ;

public readonly int $nodeType ;

public readonly DOMNode $parentNode ;

public readonly DOMNodeList $childNodes ;

public readonly DOMNode $firstChild ;

public readonly DOMNode $lastChild ;

public readonly DOMNode $previousSibling ;

public readonly DOMNode $nextSibling ;

public readonly DOMNamedNodeMap $attributes ;

public readonly DOMDocument $ownerDocument ;

public readonly string $namespaceURI ;

public string $prefix ;

public readonly string $localName ;

public readonly string $baseURI ;

public string $textContent ;

/* 方法 */

public appendXML ( string $data ) : bool

/* 继承的方法 */

public DOMNode::appendChild ( DOMNode $newnode ) : DOMNode

public DOMNode::C14N ([ bool $exclusive [, bool $with_comments [, array $xpath [, array $ns_prefixes ]]]] ) : string

public DOMNode::C14NFile ( string $uri [, bool $exclusive = FALSE [, bool $with_comments = FALSE [, array $xpath [, array $ns_prefixes ]]]] ) : int

public DOMNode::cloneNode ([ bool $deep ] ) : DOMNode

public DOMNode::getLineNo ( void ) : int

public DOMNode::getNodePath ( void ) : string

public DOMNode::hasAttributes ( void ) : bool

public DOMNode::hasChildNodes ( void ) : bool

public DOMNode::insertBefore ( DOMNode $newnode [, DOMNode $refnode ] ) : DOMNode

public DOMNode::isDefaultNamespace ( string $namespaceURI ) : bool

public DOMNode::isSameNode ( DOMNode $node ) : bool

public DOMNode::isSupported ( string $feature , string $version ) : bool

public DOMNode::lookupNamespaceUri ( string $prefix ) : string

public DOMNode::lookupPrefix ( string $namespaceURI ) : string

public DOMNode::normalize ( void ) : void

public DOMNode::removeChild ( DOMNode $oldnode ) : DOMNode

public DOMNode::replaceChild ( DOMNode $newnode , DOMNode $oldnode ) : DOMNode

}

DOMDocumentFragment::appendXML — Append raw XML data

User Contributed Notes

peter at softcoded dot com 03-May-2017 03:31


DOMDocumentFragment makes it easy to add (or replace)

nodes. Individually creating nodes using DOM methods can

be tedious. Instead, do something like this:



/**

* Create fragment of colgroup

* @param DOMDocument $doc The DOMDocument

* @return DOMDocumentFragment

*/

function makeFragment($d){

  $chunk = <<<HTML

  <colgroup>

    <col class="c1"/>

    <col class="c2"/>

    <col class="c3"/>

    <col class="c4"/>

  </colgroup>

HTML;

  $fragment = $d->createDocumentFragment();

  $fragment->appendXML($chunk);

  return $fragment;

}

Ricki 29-Mar-2011 06:00


DOMDocumentFragment only appears useful if created from a parent DOMDocument eg.



1. $dom = new DOMDocument("1.0","UTF-8");

2. $docFrag = $dom->createDocumentFragment();

3. Now append items to $docFrag 

4. Graft $docFrag contents back onto $dom at the desired location



Conversely taking this approach:

1. $dom = new DOMDocument("1.0","UTF-8");

2. $docFrag = new DOMDocumentFragment();

3. Now append items to $docFrag



...will fail on step 3 with a "read only" error as $docFrag is not created as a child of  DOMDocument.



I'm not sure of the reason for this: on the web people have cited security, and others have cited poor design however whatever the reason, it is really limiting when wanting to encapsulating generic independent DocumentFragments into classes for easy grafting to the desired tree. The only workarounds i have seen look expensive from a performance perspective and cumbersome from a coding perspective ie. create a  dummy $dom for temporary use.



(This is valid as of PHP 5.3) I've put this here as i've wasted a lot of time finding it out - I hope this saves others some heartache.



Using new DOMDocumentFramt

matthijs at stdin dot nl 29-Mar-2011 03:06


Note that DOMDocumentFragment is a bit special when it's added to another node. When that happens, not the fragment itself is added as a child, but all of the children of the fragment are moved over to the new parent node.



For example, consider this script:



<?php



/* Create a document and a fragment containing a single node */

$doc = new DOMDocument();

$fragment = $doc->createDocumentFragment();

$fragment->appendChild($doc->createElement('foo'));



/* Now, the foo node is a child of the fragment */

var_dump($fragment->firstChild);



/* After appending the fragment to another node, the children of the

 * fragment will have been transfered to that node (and the fragment is

 * not present in the children list!) */

$doc->appendChild($fragment);

/* So the fragment has no children anymore */

var_dump($fragment->firstChild);

/* But $doc has a single child, which is the foo element, not the

 * fragment */

var_dump($doc->childNodes->length);

var_dump($doc->firstChild);



?>



This produces the following output:



object(DOMElement)#3 (0) {

}

NULL

int(1)

object(DOMElement)#3 (0) {

}

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The DOMDocumentFragment class

类摘要

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