How to immediately delete files uploaded to the server after sending the form?

<?php
// change the next line to match your upload folder
// Use this version for Joomla! 2.5 or earlier
$files = glob(JPATH_SITE.DS.'components'.DS.'com_chronoforms'.DS.'uploads'.DS.'*');
// use this version for Joomla! 3 or later
//$files = glob(JPATH_SITE.'/components/com_chronoforms/uploads/*');
// set 'keep' period to 7 days
$checktime = time() - 7 * 24 * 60 * 60;
foreach ( $files as $v ) {
  if ( is_file($v) && filemtime($v) < $checktime ) {
    unlink($v);
  }
}
?>

foreach($this->get("upload#.[n].path") as $file)
   unlink($file);