note 100097 deleted from function.filesize by aharvey

Note Submitter: joaoptm78 at gmail dot com ---- And this is my short and very clever simple function. Faster than some of the examples below. <?php function format_bytes($size) { $units = array(' B', ' KB', ' MB', ' GB', ' TB'); for ($i = 0; $size >= 1024 && $i < 4; $i++) $size /= 1024; return round($size, 2).$units[$i]; } ?> You can add more units to the $units array and change the number 4 in "$i < 4" accordingly. But if you want it really fast try this not-so-neat function: <?php function format_bytes($bytes) { if ($bytes < 1024) return $bytes.' B'; elseif ($bytes < 1048576) return round($bytes / 1024, 2).' KB'; elseif ($bytes < 1073741824) return round($bytes / 1048576, 2).' MB'; elseif ($bytes < 1099511627776) return round($bytes / 1073741824, 2).' GB'; else return round($bytes / 1099511627776, 2).' TB'; } ?> I guess you can do it in 1000 different ways :)