[fw-mvc] Deleting files older than 30 days -- qiestion

Hi,

 

I am using thecode below to delete files from the image cache folder. How can I modify it to only delete files older than 30 days?

<?php

 set_time_limit(900);

 delete_folder(dirname(__FILE__) .'/cache/');
 echo '<strong>Done</strong';

 function delete_folder($folder) {
  $folder_contents = get_folder_contents($folder);

  if ($folder_contents) {
   foreach ($folder_contents as $__content) {
    echo $__content['item'] .'<br />';
    if (is_dir($__content['item']))
     delete_folder($__content['item']);
    else
     unlink($__content['item']);
   }
  }
  rmdir($folder);
 }

 function get_folder_contents($folder) {
  if( !is_dir($folder) ) {
   return false;
  }
  $return_array = array();
  $count    = 0;
  if( $dh = opendir($folder) ) {
   while( ($file = readdir($dh)) !== false ) {
    if( $file == '.' || $file == '..' ) continue;
    $return_array[$count]['item'] = $folder .$file .(is_dir($folder .$file) ? DIRECTORY_SEPARATOR : '');

    $count++;
   }
   closedir($dh);
  }
  return $return_array;
 }

Any suggestions on improving the above code is appreciated.

-R