XMLWriter::startAttributeNs()函數是PHP中的一個內置函數,用於啟動命名空間屬性。稍後可以使用XMLWriter::endAttribute()函數關閉此屬性。通常,網頁樣式無法在命名空間屬性中使用。
用法:
bool XMLWriter::startAttributeNs( string $prefix, string $name, string $uri )
參數:此函數接受上述和以下所述的三個參數:
- $prefix:它指定名稱空間的前綴。
 - $name:它指定名稱空間的名稱。
 - $uri:它指定名稱空間的值。
 
返回值:如果成功,此函數將返回TRUE,否則將返回FALSE。
以下示例說明了PHP中的XMLWriter::startAttributeNs()函數:
範例1:
<?php 
  
// Create a new XMLWriter instance 
$writer = new XMLWriter(); 
   
// Create the output stream as PHP 
$writer->openURI('php://output'); 
   
// Start the document 
$writer->startDocument('1.0', 'UTF-8'); 
   
// Start a element 
$writer->startElement('div'); 
   
// Start the namespaced attribute 
$writer->startAttributeNs('pre', 'attrib', 'value'); 
   
// Add value to the attribute 
$writer->text('value'); 
   
// End the attribute 
$writer->endAttribute(); 
   
// End the element 
$writer->endElement(); 
   
// End the document 
$writer->endDocument(); 
?>輸出:
<?xml version="1.0" encoding="UTF-8"?> <div pre:attrib="value" xmlns:pre="value"/>
範例2:
<?php 
  
// Create a new XMLWriter instance 
$writer = new XMLWriter(); 
   
// Create the output stream as PHP 
$writer->openURI('php://output'); 
   
// Start the document 
$writer->startDocument('1.0', 'UTF-8'); 
   
// Start a element 
$writer->startElement('div'); 
   
// Start the namespaced attribute with style attribute 
// This will not work because it is namespaced 
$writer->startAttributeNs('style', 'attrib', 'value'); 
   
// Add value to the attribute 
$writer->text('color:blue'); 
   
// End the attribute 
$writer->endAttribute(); 
  
// Add value to the element 
$writer->text('Namespaced GeeksforGeeks'); 
   
// End the element 
$writer->endElement(); 
  
// Start a h1 element 
$writer->startElement('h1'); 
   
// Start the style attribute 
$writer->startAttribute('style'); 
   
// Add value to the attribute 
$writer->text('color:green'); 
   
// End the attribute 
$writer->endAttribute(); 
   
// Add value to the element 
$writer->text('Normal GeeksforGeeks'); 
   
// End the element 
$writer->endElement(); 
   
// End the document 
$writer->endDocument(); 
?>輸出:

參考: https://www.php.net/manual/en/function.xmlwriter-start-attribute-ns.php
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