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(PHP 5, PHP 7, PHP 8)

DOMImplementation::createDocumentType Creates an empty DOMDocumentType object


public DOMImplementation::createDocumentType(string $qualifiedName, string $publicId = "", string $systemId = ""): DOMDocumentType|false

Creates an empty DOMDocumentType object. Entity declarations and notations are not made available. Entity reference expansions and default attribute additions do not occur.



The qualified name of the document type to create.


The external subset public identifier.


The external subset system identifier.


A new DOMDocumentType node with its ownerDocument set to null.



Raised if there is an error with the namespace, as determined by qualifiedName.

Vor PHP 8.0.0 konnte diese Methode statisch aufgerufen werden, gab dabei aber einen Fehler der Stufe E_DEPRECATED aus. Seit PHP 8.0.0 löst der statische Aufruf dieser Methode eine Error-Exception aus.


Beispiel #1 Creating a document with an attached DTD


// Creates an instance of the DOMImplementation class
$imp = new DOMImplementation;

// Creates a DOMDocumentType instance
$dtd = $imp->createDocumentType('graph', '', 'graph.dtd');

// Creates a DOMDocument instance
$dom = $imp->createDocument("", "", $dtd);

// Set other properties
$dom->encoding = 'UTF-8';
$dom->standalone = false;

// Create an empty element
$element = $dom->createElement('graph');

// Append the element

// Retrieve and print the document
echo $dom->saveXML();


Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE graph SYSTEM "graph.dtd">

Siehe auch

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User Contributed Notes 1 note

until-all-bytes-are-free at example dot org
11 years ago
I had problems to use a DTD from a file. It needed to be resolved relatively and it contained characters that made DomDocument failed to resolve the file.

Encoding and an absolute filename did not help much. So I used the data:// streamwrapper ( ) as a work-around:


// relative or absolute filename
$path = '...';

// convert file contents into a filename
$data = file_get_contents($path);
$systemId = 'data://text/plain;base64,'.base64_encode($data);

// ...

// Creates a DOMDocumentType instance
$dtd = $aImp->createDocumentType('qualified name', '', $systemId);


Works like a charm.
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