函数名：SimpleXMLElement::addAttribute()
适用版本：PHP 5, PHP 7
用法：该函数用于向SimpleXMLElement对象添加一个属性。它接受两个参数：属性名称和属性值。
示例：
$xmlString = 'PHP Basics';
$xml = new SimpleXMLElement($xmlString);
// 添加一个属性
$xml->addAttribute('version', '1.0');
// 输出XML
echo $xml->asXML();
输出：
PHP Basics
在上面的示例中，我们创建了一个包含</code>元素的XML字符串，并使用<code>SimpleXMLElement</code>类将其转换为对象。然后，我们使用<code>addAttribute()</code>函数向该对象添加一个名为<code>version</code>，值为<code>1.0</code>的属性。最后，我们使用<code>asXML()</code>方法将对象转换回XML字符串，并将其输出。</p>
<p>请注意，<code>addAttribute()</code>函数必须在<code>SimpleXMLElement</code>对象上调用，而不是在<code>SimpleXMLElement</code>类上调用。</p> </section>
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