如何从文件夹中读取/选择文件名时对A - > Z进行排序

This might be very obvious however I cannot seem to solve it.

I have the following option menu :

<select name="Image2" onChange="showImage(this.value)">
    <option value="" selected="selected"></option>
  <?php 
     $dir = "../somefolder";//your path
    $dh  = opendir($dir);
    while (false !== ($filename = readdir($dh))) {
        $files[] = $filename;
  echo "<option value='". $filename . "'>" . $filename . "</option>";  }
    sort($files);
 ?>

</select> 
<div id="image_div"></div> 

<script type="text/javascript">
 function showImage(value)
 {
  var img = "<img src='../somefolder/"+value+"' />";
  document.getElementById('image_div').innerHTML = img;
 }
</script>

Which works fine, but all the files are not sorted a-->z is there a way to do this, I have over 100 files in this folder? Any help Welcome

You can do two loops, one to read the filenames, and other to output them.

Since you have about 100 files, it will not change the response time...

$dh  = opendir($dir);
while (false !== ($filename = readdir($dh))) {
        $files[] = $filename;
}
sort($files);
foreach ($files as $filename){
     echo "<option value='". $filename . "'>" . $filename . "</option>";
}