(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.

Elenco dei parametri


The qualified name of the document type to create.


The external subset public identifier.


The external subset system identifier.

Valori restituiti

A new DOMDocumentType node with its ownerDocument set to null or false on error.



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

Questo metodo può essere chiamato in modo statico, ma genererà un errore E_STRICT.


Example #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();


Il precedente esempio visualizzerà:

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

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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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