php - 解析xml版本2 PHP

Question

我试图用 simpleXMLElement 读取 xml 版本 2 并出错。这是我的示例 xml

<?xml version="2.0"?>
<books>
  <book id="978-1594489501">
    <title>My books</title>
    <author>Someone</author>
    <publisher>publisher</publisher>
    <price>14.27</price>
  </book>
</books>

PHP代码：

$xml = new SimpleXMLElement('books.xml', null, true);
$attributes = $element->attributes();   // get all attributes
$children   = $element->children();     // get all children

foreach($children as $key => $value){
  echo $value;
}