Question

I want to generate alphanumeric unique numbers but the format should be like this

that should be starts from AA001 to AA999 after that AB001 to AB999 …. BA001 to BA999 end with ZZ999. if i give the input is

  1 = result AA001
 999  = result AA999
 1000 = result AB001 

any one can help this ?

Answer 1

How about:

$start = 'AA997';
for($i = 0; $i < 5; $i++) {
    $start++;
    if (substr($start, 2) == '000') continue;
    echo $start,"\n";
}

output:

AA998
AA999
AB001
AB002