Easiest Solution For Auto Updating Images Using My Current PHP Script?

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<?php
$in_dir = 'queue/';  // From directory
$out_dir = 'images/'; // To directory
$indir = dir($in_dir);
$dirlist = array();
while ($file = $indir->read()) { // read filenames
  if(0 != strpos($file, '.jpg')) // if filename has .jpg in it
      $dirlist[] = $file;        // add to array
}
$indir->close();
$howmany = rand(10,20);  // move from 10 to 20
$images = array_slice($dirlist, 0, $howmany);
foreach ($images as $curr) {
  if (copy("$in_dir$curr","$out_dir/$curr")) {
    unlink("$in_dir/$curr");
    }
  }