PHP函数：XMLReader::getAttributeNo()
适用版本：PHP 5 >= 5.1.0, PHP 7
函数描述：获取当前节点的指定编号的属性值
语法：public string XMLReader::getAttributeNo ( int $index )
参数：
返回值：返回指定编号的属性值，如果属性不存在或者无效索引号，则返回空字符串
示例：
$xml = <<
Harry Potter
J.K. Rowling
2005
XML;
$reader = new XMLReader();
$reader->xml($xml);
while ($reader->read()) {
if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == 'title') {
$attrValue = $reader->getAttributeNo(0);
echo "Attribute value: " . $attrValue;
break;
}
}
// 输出结果：Attribute value: en
在上面的示例中，我们创建了一个XMLReader对象并加载了一个XML字符串。然后，我们使用read()方法遍历XML文档，找到</code>元素。使用<code>getAttributeNo()</code>方法，我们获取了<code><title></code>元素的第一个属性的值，并将其打印出来。在这个例子中，<code><title></code>元素有一个<code>lang</code>属性，其值为<code>en</code>。</p>
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