DOMImplementation::createDocumentType

(PHP 5, PHP 7, PHP 8)

DOMImplementation::createDocumentType — Creates an empty DOMDocumentType object

說(shuō)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.

參數(shù)

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.

錯(cuò)誤／異常

DOM_NAMESPACE_ERR

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

在 PHP 8.0.0 之前可以靜態(tài)調(diào)用此方法，但會(huì)發(fā)出 E_DEPRECATED 錯(cuò)誤。自 PHP 8.0.0 起，靜態(tài)調(diào)用此方法會(huì)拋出 Error 異常

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();

?>

以上例程會(huì)輸出：

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

參見(jiàn)