PHP - xmlwriter_start_dtd() 函式

定義和用法

XML 是一種標記語言，用於在網路上共享資料，XML 既可以被人閱讀，也可以被機器讀取。XMLWriter 擴充套件內部使用 libxml xmlWriter API，用於寫入/建立 XML 文件的內容。由此生成的 XML 文件是非快取的且是單向的。

xmlwriter_start_dtd() 函式用於建立 DTD 標記的開始。

語法

xmlwriter_start_dtd($writer, $name, $public_id, $system_id);

引數

序號	引數及描述
1	writer（必填）這是 XMLWriter 類的一個物件，代表您要修改/建立的 XML 文件。
2	name（必填）這是一個字串值，代表文件型別的限定名稱。
3	public_id（可選）這是一個字串值，代表文件型別的限定名稱。
4	system_id（可選）這是一個字串值，代表文件型別的限定名稱。

返回值

此函式返回一個布林值，成功時為 TRUE，失敗時為 FALSE。

PHP 版本

此函式首次在 PHP 5 版本中引入，並在所有後續版本中可用。

示例

以下示例演示了 xmlwriter_start_dtd() 函式的用法：

<?php
   //Opening a writer
   $uri = "result.xml";
   $writer = xmlwriter_open_uri($uri);

   //Starting the document
   xmlwriter_start_document($writer);

   //Starting the Dtd tag
   xmlwriter_start_dtd($writer, 'test_dtd', 'pub_1001', 'sys_1001');

   //Ending the Dtd tag
   xmlwriter_end_dtd($writer); 
   xmlwriter_set_indent($writer, TRUE);
   xmlwriter_set_indent_string($writer, "    ");

   //Starting an element
   xmlwriter_start_element($writer, 'Tutorial');

   //Starting a element tag
   xmlwriter_start_element($writer, 'name');

   //Adding text to the element
   xmlwriter_text($writer, 'JavaFX');  
   xmlwriter_end_element($writer);
   xmlwriter_start_element($writer, 'Author');
   
   //Adding text to the element
   xmlwriter_text($writer, 'Krishna');  
   xmlwriter_end_element($writer);

   //Ending the element
   xmlwriter_end_element($writer);

   //Ending the document
   xmlwriter_end_document($writer);
?>

這將生成以下 XML 文件：

<?xml version="1.0"?>
<!DOCTYPE test_dtd PUBLIC "pub_1001" "sys_1001"><Tutorial>
   <name>JavaFX</name>
   <Author>Krishna</Author>
</Tutorial>

示例

以下是此函式的面向物件風格示例：

<?php
   //Creating an XMLWriter
   $writer = new XMLWriter();

   //Opening a writer
   $uri = "result.xml";
   $writer->openUri($uri);

   //Starting the document
   $writer->startDocument();

   //Setting the indentation on
   $writer->setIndent(TRUE);
   
   //Setting the indentation
   $writer->setIndentString("    ");

   //Starting the Dtd tag
   $writer->startDtd('test_dtd', 'pub_1001', 'sys_1001');

   //Ending the Dtd tag
   $writer->endDtd(); 

   //Starting an element
   $writer->startElement('Tutorial');
   $writer->startElement('name');
   
   //Adding text to the element
   $writer->text('JavaFX');  
   $writer->endElement();
   $writer->startElement('Author');
   
   //Adding text to the element
   $writer->text('Krishna');  
   $writer->endElement();

   //Ending the element
   $writer->endElement();
   
   //Ending the document
   $writer->endDocument();
?>

這將生成以下 XML 文件：

<?xml version="1.0"?>
<!DOCTYPE test_dtd PUBLIC "pub_1001" "sys_1001">
<Tutorial>
   <name>JavaFX</name>
   <Author>Krishna</Author>
</Tutorial>

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