XMLWriter::startAttributeNs()函数是PHP中的一个内置函数,用于启动命名空间属性。稍后可以使用XMLWriter::endAttribute()函数关闭此属性。通常,网页样式无法在命名空间属性中使用。
用法:
bool XMLWriter::startAttributeNs( string $prefix, string $name, string $uri )
参数:此函数接受上述和以下所述的三个参数:
- $prefix:它指定名称空间的前缀。
 - $name:它指定名称空间的名称。
 - $uri:它指定名称空间的值。
 
返回值:如果成功,此函数将返回TRUE,否则将返回FALSE。
以下示例说明了PHP中的XMLWriter::startAttributeNs()函数:
范例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(); 
?>输出:
<?xml version="1.0" encoding="UTF-8"?> <div pre:attrib="value" xmlns:pre="value"/>
范例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(); 
?>输出:

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