function humanSize( $size )
{
        $sizeNames = array( 'b', 'kb', 'mb', 'gb' );
        $whichName = 0;

        while( $size > 1024 && $whichName++ < count($sizeNames) - 1 && ($size = $size / 1024) );

        printf("%.2f%s\n", $size, $sizeNames[$whichName]);
}