CODEWITHSUNDEEP
phpregexformattingmac-address
user470760
user470760

Reputation:

Convert MAC Address Format

I just wrote a small script to pull hundreds of MAC Addresses from a switch for comparison, however they are formatted as "0025.9073.3014" rather than the standard "00:25:90:73:30:14".

I am stumped on how to convert this, where the best I can come up with is exploding these into pieces at the ".", then breaking them down further into 2 pieces each, then rejoin all parts with ":" separators.

I am okay with hacky methods but this is bothering me because that is a very poor approach. Is there any way to perform this better?

Upvotes: 3

Views: 8305

Answers (5)

jspit
jspit

Reputation: 7703

This universal function uses sscanf to parse the string and vsprintf to format the output.

function formatMac($string,$formatInput,$formatOutput)
{
  return vsprintf($formatOutput,sscanf($string,$formatInput));
}

Examples of usage:

$string = "0025.9073.3014";
echo formatMac($string,'%02s%02s.%02s%02s.%02s%02s','%02s:%02s:%02s:%02s:%02s:%02s');
//00:25:90:73:30:14

$string = '00:a0:3d:08:ef:63';
echo formatMac($string,'%x:%x:%x:%x:%x:%x','%02X%02X%02X:%02X%02X%02X');
//00A03D:08EF63

$string = '00A03D:08EF63';
echo formatMac($string,'%02X%02X%02X:%02X%02X%02X','%02x:%02x:%02x:%02x:%02x:%02x');
//00:a0:3d:08:ef:63

Upvotes: 0

Jonny 5
Jonny 5

Reputation: 12389

A combination of str_replace and preg_replace:

$str = preg_replace('~..(?!$)~', '\0:', str_replace(".", "", $str));

First stripping out the . then adding : after .. two of any characters (?!$) if not at the end.

Test at eval.in

Or use a capture group and do it without str_replace: 

$str = preg_replace('~(..)(?!$)\.?~', '\1:', $str);

Test at regex101.com

There's not much difference in performance.

Upvotes: 5

falsetru
falsetru

Reputation: 369244

Using preg_replace with capturing groups, backreferences:

$mac = "0025.9073.3014";
$mac = preg_replace('/(..)(..)\.(..)(..)\.(..)(..)/',
                    '$1:$2:$3:$4:$5:$6', $mac);
echo($mac);
// => 00:25:90:73:30:14

Upvotes: 2

hwnd
hwnd

Reputation: 70732

Another option, if the mac address is constant in this format.

$str = '0025.9073.3014';
$str = preg_replace('~\d+\K(?=\d\d)|\.~', ':', $str);
echo $str; //=> "00:25:90:73:30:14"

Upvotes: 0

Tibor B.
Tibor B.

Reputation: 1690

If you don't like regular expressions, then here's another method of doing it, which is more understandable, if you're new to PHP. Basically, it just removes the dots, and then splits the string into an array after every 2 characters, then implodes them with a colon:

$string = "0025.9073.3014";
$result = implode(":", str_split(str_replace(".", "", $string), 2));
echo $result;

Outputs:

00:25:90:73:30:14

Upvotes: 3

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