php使用simplexml_load_file加载XML文件并显示XML的方法

<?php
  $xml = simplexml_load_file("sample.xml");
  echo htmlspecialchars($xml->asxml());
?>

<library>
  <book>
   <title>a</title>
   <author gender="female">b</author>
   <description>c</description>
  </book>
  <book>
   <title>c</title>
   <author gender="male">d</author>
   <description>e</description>
  </book>
  <book>
   <title>f</title>
   <author gender="male">g</author>
   <description>h</description>
  </book>
</library>