Format File Size

function GetFileSize($nBytes)
{
if ($nBytes >= pow(2,40))
{
$strReturn = round($nBytes / pow(1024,4), 2);
$strSuffix = "TB";
}
elseif ($nBytes >= pow(2,30))
{
$strReturn = round($nBytes / pow(1024,3), 2);
$strSuffix = "GB";
}
elseif ($nBytes >= pow(2,20))
{
$strReturn = round($nBytes / pow(1024,2), 2);
$strSuffix = "MB";
}
elseif ($nBytes >= pow(2,10))
{
$strReturn = round($nBytes / pow(1024,1), 2);
$strSuffix = "KB";
}
else
{
$strReturn = $nBytes;
$strSuffix = "Byte";
}

if ($strReturn == 1)
{
$strReturn .= " " . $strSuffix;
}
else
{
$strReturn .= " " . $strSuffix . "s";
}

return $strReturn;
}
?>