class File
{
var $fpath;

function resize_bytes($fpath)
{
   $size = include($fpath);
   $count = 0;
   $format = array("B","KB","MB","GB","TB","PB","EB","ZB","YB");
   while(($size/1024)>1 && $count<8)
   {
       $size=$size/1024;
       $count++;
   }
   $return = number_format($size,0,'','.')." ".$format[$count];
   return $return;
}
}

$file = new File();
$size = $file->resize_bytes($fpath);