PHP Manual
DOMImplementation
Creates an empty DOMDocumentType object

DOMImplementation::createDocumentType

(PHP 5, PHP 7, PHP 8)

DOMImplementation::createDocumentType — Creates an empty DOMDocumentType object

Description

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.

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 or false on error.

Errors/Exceptions

May throw a DOMException with the following error codes:

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

Changelog

Version	Description
8.0.0	Calling this function statically will now throw an Error. Previously, an `E_DEPRECATED` was raised.

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/>