byte byte conversion to B,KB,MB,GB,TB

Today in doing a network audit log when required to export the report, there is a mail attachment file size, the database is bytes byte number, the request to convert to KB display, use the following function, quite to the force, special to share.

function Sizeformat ($bytesize) {
$i = 0;

When the $bytesize is greater than 1024 bytes, start the loop, when the loop jumps to the 4th time;
while (ABS ($bytesize) >=1024) {
$bytesize = $bytesize/1024;
$i + +;
if ($i ==4) break;
}

The BYTES,KB,MB,GB,TB is defined as a one-dimensional array;

$units = Array ("Bytes", "KB", "MB", "GB", "TB");
$newsize =round ($bytesize, 2);
Return ("$newsize $units [$i]");

}