PHP xmlwriter_flush()用法及代碼示例

定義和用法

XML 是一種 mark-up 語言，用於在網絡上共享數據，XML 用於人類 read-able 和機器 read-able。 XMLWriter 擴展內部具有 libxml xmlWriter API，用於編寫/創建 XML 文檔的內容。由此生成的 XML 文檔是非緩存的和 forward-only。

這個xmlwriter_flush()函數接受 XMLWriter 類的對象作為參數並刷新當前緩衝區。

用法

xmlwriter_flush($xmlwriter, $bool);

參數

Sr.No	參數及說明
1	writer(Mandatory) 這是 XMLWriter 類的一個對象，表示您要修改/創建的 XML 文檔。
2	bool(Optional) 這是一個布爾值，指定是否清空緩衝區。

返回值

如果編寫器在內存中打開，則此函數返回一個 XML 緩衝區，如果我們使用 URI，則它返回字節數。

PHP版本

這個函數最初是在 PHP 版本 5 中引入的，並且適用於所有後續版本。

示例

下麵的例子演示了xmlwriter_flush()函數 -

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

   //Starting the document
   xmlwriter_start_document($writer);

   //Creating XML elements
   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($writer, 'JavaFX');  
   xmlwriter_full_end_element($writer);
   xmlwriter_start_element($writer, 'Author');
   
   //Adding text to the element
   xmlwriter_text($writer, 'Krishna');  
   xmlwriter_full_end_element($writer);

   //Ending the element
   xmlwriter_full_end_element($writer);

   //Ending the document
   xmlwriter_full_end_element($writer);

   //Flushing the contents of the document
   xmlwriter_flush($writer, TRUE);
?>

這將生成以下 XML 文檔 -

<?xml version="1.0"?>
<Tutorial>
   <name>JavaFX</name>
   <Author>Krishna</Author>
</Tutorial>

示例

以下是麵向對象風格的此函數的示例 -

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

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

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

   //Starting an element
   $writer->startElement('Msg');

   //Adding text to the element
   $writer->text('Welcome to Tutorialspoint');  

   //Ending the element
   $writer->fullEndElement();

   //Ending the document
   $writer->fullEndElement();

   //Flushing the contents of the XMLWriter
   $writer->flush(TRUE);
?>

這將生成以下 XML 文檔 -

<?xml version="1.0"?>
<Msg>Welcome to Tutorialspoint</Msg>