Human readable file size

human_size.php

<?php 
function human_size ($size) { 
  if ($size <= 1024) return $size.' Bytes'; 
  else if ($size <= (1024*1024)) return sprintf('%d KB',(int)($size/1024)); 
  else if ($size <= (1024*1024*1024)) return sprintf('%.2f MB',($size/(1024*1024))); 
  else return sprintf('%.2f Gb',($size/(1024*1024*1024))); 
} 
echo human_size(32768);
?>