File handling example from
http://platon.sk/forum/projects/viewtopic.php?t=737475

$dir = "/html/public_html/img/";

$dh = opendir($dir);

$files = array();

while ($file = readdir($dh)){
  # Only track files then end in "jpg"
  if (preg_match("/jpg$/", $file)){
    array_push($files, $file);
  }
}

# Arrange file names alphabetically
sort($files);

$opts['fdd']['leftPic'] = array(
  'name'     => 'LeftPic',
  'select'   => 'D',
  'maxlen'   => 35,
  'sort'     => true,
);

$opts['fdd']['leftPic']['values'] = $files;