Question

I wrote this php script to delete old files older than 24 hrs,
but it deleted all the files including newer ones:

<?php
  $path = 'ftmp/';
  if ($handle = opendir($path)) {
     while (false !== ($file = readdir($handle))) {
        if ((time()-filectime($path.$file)) < 86400) {  
           if (preg_match('/\.pdf$/i', $file)) {
              unlink($path.$file);
           }
        }
     }
   }
?>

Answer 1

(time()-filectime($path.$file)) < 86400

If the current time and file’s changed time are within 86400 seconds of each other, then…

 if (preg_match('/\.pdf$/i', $file)) {
     unlink($path.$file);
 }

I think that may be your problem. Change it to > or >= and it should work correctly.