SimpleXML:在选择包含命名空间属性的节点时，如何获取其他属性？

$xml = '<root xmlns:ns="http://example.com/ns">
            <node ns:attr1="value1" attr2="value2" attr3="value3">Node Content</node>
        </root>';

// 将XML字符串加载为SimpleXMLElement对象
$simpleXml = simplexml_load_string($xml);

// 获取节点的属性列表
$attributes = $simpleXml->node->attributes();

// 获取其他属性值
$attr1Value = (string) $attributes['{http://example.com/ns}attr1'];
$attr2Value = (string) $attributes['attr2'];
$attr3Value = (string) $attributes['attr3'];

// 打印属性值
echo "attr1: " . $attr1Value . "\n";
echo "attr2: " . $attr2Value . "\n";
echo "attr3: " . $attr3Value . "\n";

attr1: value1
attr2: value2
attr3: value3