This function formats a size in bytes to anything in the range of KB, Mb, GB, and Tb.

Example:
	echo size_format(filesize("."));


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function size_format($size)
{
	$size /= 1024;
	
	if($size < 1024)
	{
		$size = number_format($size, 2);
		$size .= "kb";
	}
	else
	{
		if(($size / 1024) < 1024)
		{
			$size = number_format($size / 1024, 2); 
            $size .= 'mb';
		}
		elseif($size / 1024 / 1024 < 1024)
		{
			$size = number_format($size / 1024 / 1024, 2); 
            $size .= 'gb';
		}
		else
		{
			$size = number_format($size / 1024 / 1024 / 1024, 2); 
            $size .= 'tb';
		}
	}
	return $size;
}