php unique alpha numeric id

I have seen a few post on this, but nothing that would work entirely for what I'm trying to do. Pretty much I want to generate a new id for clients in this 开发者_运维技巧script. What I want to do is add a new entry to my database, get the id, and then multiply by say A1A1, or something like that. So it would be like

A1A1 - 1st id
A1A2 - 2nd id
A1A3 - 3rd id

(so on and so fort).

Anyone got any ideas where I should start with that?

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Just increment your string:

$id = 'A1A1';

$new_id = ++ $id; // $new_id is now A1A2

See it on Ideone

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Not sure if this would work, but typically generates somewhat sequential hexdecimal numbers based on the current microsecond.

uniqid();

http://www.php.net/manual/en/function.uniqid.php

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If you are using a SQL database, I would highly suggest checking out auto increment. For example, here is auto-increment for mysql.

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You may split the whole id into alphabets and numerals. Then increment the corresponding numeral and concatenate back. If you have to make record deletion, take care of the re-arranging the sequence.