PHP xmlwriter_set_indent()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_set_indent()函數接受 XMLWriter 類的對象和布爾值作為參數，並根據傳遞的布爾值設置打開/關閉輸出 XML 文檔的縮進。

用法

xmlwriter_set_indent($writer, $indentation);

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	indentation(Mandatory) 這是一個布爾值，指定是否對輸出文檔進行縮進。

返回值

此函數返回一個布爾值，成功時為 TRUE，失敗時為 FALSE。

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_set_indent()函數 -

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

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

   //Starting the document
   xmlwriter_start_document($writer);

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

   //Setting indentation
   xmlwriter_set_indent($writer,TRUE);
   xmlwriter_set_indent_string($writer, "    ");
   
   //Creating XML elements
   xmlwriter_write_element($writer, 'name', 'JavaFX');  
   xmlwriter_write_element($writer, 'author', 'Krishna');  
   xmlwriter_write_element($writer, 'pages', '535');  

   //Ending the element
   xmlwriter_end_element($writer);

   //Ending the document
   xmlwriter_end_document($writer);
   print("XML Document Created");
?>

這將生成以下 XML 文檔 -

<?xml version="1.0"?>
<Tutorial>
   <Name>JavaFX</Name>
   <Author>Krishna</Author>
   <Pages>535</Pages>
</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();
   $uri = "result.xml";

   //Opening a writer
   $writer->openUri($uri);

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

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

   //Setting indentation
   $writer->setIndent(TRUE);
   $writer->setIndentString("    ");
   
   //Creating XML elements
   $writer->writeElement('Name', 'JavaFX');  
   $writer->writeElement('Author', 'Krishna'); 
   $writer->writeElement('Pages', '535');  

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

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

這將生成以下 XML 文檔 -

<?xml version="1.0"?>
<Tutorial>
   <Name>JavaFX</Name>
   <Author>Krishna</Author>
   <Pages>535</Pages>
</Tutorial>