title: sorting scandir by date Descending order
body: <p>i am using this code for listing a directory</p>
  
  <pre><code>foreach(scandir('back/1') as $folder){
      if (in_array($folder, array('.', '..'))) continue;
      echo basename($folder); // get folder's name
  }
  </code></pre>
  
  <p>but i want to sort the directories input by modifecation time.</p>
  
  <p>how to do it.</p>
  
  <p>Regards</p>