Creates an empty DOMDocumentType object

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- 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

`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 documentecho $dom->saveXML();?>

The above example will output:

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

### See Also

- DOMImplementation::createDocument() - Creates a DOMDocument object of the specified type with its document element