[edit] Last updated: Fri, 24 Jun 2011

DOMImplementation::createDocumentType

(PHP 5)

DOMImplementation::createDocumentType — Creates an empty DOMDocumentType object

Description

DOMDocumentType DOMImplementation::createDocumentType ([ string $qualifiedName = NULL [, string $publicId = NULL [, string $systemId = NULL ]]] )

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

Parameters

qualifiedName: The qualified name of the document type to create.
publicId: The external subset public identifier.
systemId: The external subset system identifier.

Return Values

A new DOMDocumentType node with its ownerDocument set to NULL.

Errors/Exceptions

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

This method may be called statically, but will issue an E_STRICT error.

Examples

Example #1 Creating a document with an attached DTD


<?php

// 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
$dom->appendChild($element);

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

?>

The above example will output:

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


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 ( http://php.net/manual/en/wrappers.data.php ) as a work-around:



<?php



// 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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