La classe DOMDocumentFragment

(PHP 5, PHP 7, PHP 8)

Synopsis de la classe

class DOMDocumentFragment extends DOMNode implements DOMParentNode {

/* Propriétés */

public readonly ?DOMElement $firstElementChild;

public readonly ?DOMElement $lastElementChild;

public readonly int $childElementCount;

/* Propriétés héritées */

public readonly string $nodeName;

public ?string $nodeValue;

public readonly int $nodeType;

public readonly ?DOMNode $parentNode;

public readonly ?DOMElement $parentElement;

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 bool $isConnected;

public readonly ?DOMDocument $ownerDocument;

public readonly ?string $namespaceURI;

public string $prefix;

public readonly ?string $localName;

public readonly ?string $baseURI;

public string $textContent;

/* Méthodes */

public __construct()

public append(DOMNode|string ...$nodes): void

public appendXML(string $data): bool

public prepend(DOMNode|string ...$nodes): void

public replaceChildren(DOMNode|string ...$nodes): void

/* Méthodes héritées */

public DOMNode::appendChild(DOMNode $node): DOMNode|false

public DOMNode::C14N(
    bool $exclusive = false,
    bool $withComments = false,
    ?array $xpath = null,
    ?array $nsPrefixes = null
): string|false

public DOMNode::C14NFile(
    string $uri,
    bool $exclusive = false,
    bool $withComments = false,
    ?array $xpath = null,
    ?array $nsPrefixes = null
): int|false

public DOMNode::cloneNode(bool $deep = false): DOMNode|false

public DOMNode::contains(DOMNode|DOMNameSpaceNode|null $other): bool

public DOMNode::getLineNo(): int

public DOMNode::getNodePath(): ?string

public DOMNode::getRootNode(?array $options = null): DOMNode

public DOMNode::hasAttributes(): bool

public DOMNode::hasChildNodes(): bool

public DOMNode::insertBefore(DOMNode $node, ?DOMNode $child = null): DOMNode|false

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

public DOMNode::isEqualNode(?DOMNode $otherNode): bool

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

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

public DOMNode::lookupNamespaceURI(?string $prefix): ?string

public DOMNode::lookupPrefix(string $namespace): ?string

public DOMNode::normalize(): void

public DOMNode::removeChild(DOMNode $child): DOMNode|false

public DOMNode::replaceChild(DOMNode $node, DOMNode $child): DOMNode|false

}

Propriétés

childElementCount: Le nombre d'éléments enfants.
firstElementChild: Premier élément enfant ou null.
lastElementChild: Dernier élément enfant ou null.

Historique

Version	Description
8.0.0	Les propriétés `firstElementChild`, `lastElementChild` et `childElementCount` ont été ajoutées.
8.0.0	DOMDocumentFragment implémente désormais DOMParentNode.

Sommaire

DOMDocumentFragment::append — Ajoute des nœuds après le dernier nœud enfant
DOMDocumentFragment::appendXML — Ajoute des données XML
DOMDocumentFragment::__construct — Construit un objet DOMDocumentFragment
DOMDocumentFragment::prepend — Ajoute des nœuds avant le premier nœud enfant
DOMDocumentFragment::replaceChildren — Remplace les enfants dans le fragment

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User Contributed Notes 3 notes

down

Ricki ¶

13 years ago

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

down

matthijs at stdin dot nl ¶

13 years ago

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) {
}

down

peter at softcoded dot com ¶

7 years ago

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;
}

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