Filesize formatting function

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This is an article on Filesize formatting function in PHP.
Here's a function which will format the passed bytes into KB,MB,GB...appropriately.

Code: PHP
function GetSize ($sizeb) {
   $sizekb = $sizeb / 1024;
   $sizemb = $sizekb / 1024;
   $sizegb = $sizemb / 1024;
   $sizetb = $sizegb / 1024;
   $sizepb = $sizetb / 1024;
   if ($sizeb > 1) {$size = round($sizeb,2) . "b";}
   if ($sizekb > 1) {$size = round($sizekb,2) . "kb";}
   if ($sizemb > 1) {$size = round($sizemb,2) . "mb";}
   if ($sizegb > 1) {$size = round($sizegb,2) . "gb";}
   if ($sizetb > 1) {$size = round($sizetb,2) . "tb";}
   if ($sizepb > 1) {$size = round($sizepb,2) . "pb";}
   return $size;
 }