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.

错误／异常

DOM_NAMESPACE_ERR

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

在 PHP 8.0.0 之前可以静态调用此方法，但会发出 E_DEPRECATED 错误。自 PHP 8.0.0 起，静态调用此方法会抛出 Error 异常

范例

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();

?>

以上例程会输出：

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

参见