PHP Format preexisting V4 UUID

Question

I have some php that return a V4 UUID, and example would be: a935941636384aa0b7560617c641cc2e
I need a way to get this string in a varible in this format:
a9359416-3638-4aa0-b756-0617c641cc2e
8chars - 4chars - 4chars - 13chars
Please help me accomplish this .

http://stackoverflow.com/questions/2040240/php-function-to-generate-v4-uuid — rob2universe, Dec 26 '16 at 02:32

Ahmad Mobaraki · Answer 1 · 2016-12-25T21:26:37.170

0

You can do this:

$str = 'a935941636384aa0b7560617c641cc2e';
$str1 = substr($str, 0, 8);
$str2 = substr($str, 8 ,4);
$str3 = substr($str, 12 ,4);
$str4 = substr($str, 16 ,4);
$str4 = substr($str, 20 ,12);

$final = $str1.'-'.$str2.'-'.$str3.'-'.$str4;

edited Dec 25 '16 at 21:26

answered Dec 25 '16 at 21:03

Ahmad Mobaraki

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You may want to test it again. How many chars do you have on first part ? – Pedro Lobito Dec 25 '16 at 21:21
Oh! yes. sorry. Updated the answer – Ahmad Mobaraki Dec 25 '16 at 21:24
Still wrong, read the `substr` manual. The 1st arg of `substr` is the char # to start and the 2nd is the # of chars to match - http://php.net/manual/en/function.substr.php – Pedro Lobito Dec 25 '16 at 21:26
Ok, Now you've my answer ;) – Pedro Lobito Dec 25 '16 at 21:29

Pedro Lobito · Accepted Answer · 2016-12-25T21:18:55.077

You question is poorly written and the example you gave is wrong. The last part can only have have 12 chars, also, you specified 4 groups, when in fact the string is split in 5.

You can use substr, i.e.:

<?php
$uuid = "a935941636384aa0b7560617c641cc2e";
$part1 = substr($uuid, 0, 8);
$part2 = substr($uuid, 8, 4);
$part3 = substr($uuid, 12, 4);
$part4 = substr($uuid, 16, 4);
$part5 = substr($uuid, 20, 12);

Live Demo

PHP Format preexisting V4 UUID

2 Answers2