#Human File Size
function human_filesize($bytes, $decimals = 2) {
$sz = ["B", "KB", "MB", "GB", "TB", "PB"];
if($bytes < 1024) $decimals = 0;
$factor = floor((strlen($bytes) - 1) / 3);
return sprintf("%.{$decimals}f", $bytes / pow(1024, $factor)) . @$sz[$factor];
}