DOMImplementation::createDocumentType

(PHP 5, PHP 7)

DOMImplementation::createDocumentType — Creates an empty DOMDocumentType object

说明

public 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.

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 .

错误／异常

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

此方法可以被静态调用,但会抛出一个 E_STRICT 错误。

范例

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 ();

 ?>

以上例程会输出：

<?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

用户评论:

[#1] until-all-bytes-are-free at example dot org [2011-04-09 04:28:20]

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.