Question

Hello I hope someone could help me cus Iam little bit confused about task I have to do in PHP
I need php file that is unique registration ID with these parameters:
First is AA00001 and next one is DF00002.

So first letter + 3 and second + 5, but numbers going in +1 order.

Could someone give me hint how to achieve this?
Thank you!

Answer 1

You can use substr to split the ID, dechex and hexdec to convert to/from decimal to hexadecimal, which gives you the A+3=D part, and you can use str_pad to front pad the integer with zeros, which gives you the second part, and then you just concatenate them.

ETA: Something like this:

$id = 'AA00001';

$first = dechex((hexdec(substr($id,0,1))+3)%16);
$secnd = dechex((hexdec(substr($id,1,1))+5)%16);
$int = str_pad(substr($id,2)+1,5,"0",STR_PAD_LEFT);

$newid = strtoupper($first.$secnd.$int);

ETA2: Unless you meant to go AA00001, DF00002, GK00003, JP00004, MU00005, PZ00006, SE00007 etc in which case you need

$first = chr(((ord(substr($id,0,1))-62)%26)+65);
$secnd = chr(((ord(substr($id,1,1))-60)%26)+65);