function format_mac($data, $format=1)
{
	// b - bin, h - hex, d - dec
	// $format=0 : bbbbbb
	// $format=1 : hhhhhhhhhhhh
	// $format=2 : hh:hh:hh:hh:hh:hh
	// $format=3 : hh-hh-hh-hh-hh-hh
	// $format=4 : hhhh.hhhh.hhhh
	...
}

function format_mac($data, $format=0)
{
	// b - bin, h - hex, d - dec
	// $format=0 : bbbbbb
	// $format=1 : hhhhhhhhhhhh
	// $format=2 : hh:hh:hh:hh:hh:hh
	// $format=3 : hh-hh-hh-hh-hh-hh
	// $format=4 : hhhh.hhhh.hhhh
	if (strlen($data)==6)
	{
		$bit = $data;
	}
	elseif (mb_strlen($data)==12 && preg_match("/^[0-9a-f]{12}$/i",$data))
	{
		$bit = hex2bin(strtolower($data));
	}
	elseif (mb_strlen($data)==17 && preg_match("/^[0-9a-f]{2}(:[0-9a-f]{2}){5}$/i",$data))
	{
		$bit = hex2bin(strtolower(str_replace(":","",$data)));
	}
	elseif (mb_strlen($data)==17 && preg_match("/^[0-9a-f]{2}(-[0-9a-f]{2}){5}$/i",$data))
	{
		$bit = hex2bin(strtolower(str_replace("-","",$data)));
	}
	elseif (mb_strlen($data)==14 && preg_match("/^[0-9a-f]{4}(\.[0-9a-f]{4}){2}$/i",$data))
	{
		$bit = hex2bin(strtolower(str_replace(".","",$data)));
	}
	if ($format == 0)
	{
		return $bit;
	}
	else
	{
		$fmt = array(null,'%02x%02x%02x%02x%02x%02x','%02x:%02x:%02x:%02x:%02x:%02x','%02x-%02x-%02x-%02x-%02x-%02x','%02x%02x.%02x%02x.%02x%02x');
		$bit = sprintf($fmt[$format], ord(substr($bit,0,1)),ord(substr($bit,1,1)),ord(substr($bit,2,1)),ord(substr($bit,3,1)),ord(substr($bit,4,1)),ord(substr($bit,5,1)));
		return $bit;
	}
}