[PHP] Creating alphanumeric id for a table

[aveev]

I want to create user generated id like this :
AAA0001
AAA0002
...
AAA0009
AAA0010

where the id consists of 3 alphanumeric characters and 4 numerical digits in
the beginning (for numerical digit, it can grow like this AAA10001). I try
to use php script to generate id like this, where I use the following
script.

<?
    function generate_id($num) {
        $start_dig = 4;
        $num_dig = strlen($num);
    
        $id = $num;
        if($num_dig <= $start_dig) {
            $num_zero = $start_dig - $num_dig;
        
            for($i=0;$i< $num_zero; $i++) {
                $id = '0' . $id;
            }
        }
        $id = 'AAA' . $id;
        return $id;
    }

    $app_id = generate_id(1);
  
?>

I assume that I can get increment value/sequence from db  (I used harcoded
increment value  in the code above (generate_id(1))),
but I don't know how I can get this incremental value from db.I use mysql
5.0.
Or has anyone had another solution to create this alphanumeric id  ?

Any help would be much appreciated
Thanks
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