DOMImplementation::createDocumentType

(PHP 5, PHP 7, PHP 8)

DOMImplementation::createDocumentType — Creates an empty DOMDocumentType object

说明

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.

参数

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

返回值

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

错误／异常

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

更新日志

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

示例

示例 #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();

?>

以上示例会输出：

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

参见

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

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until-all-bytes-are-free at example dot org ¶

13 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 ( 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.