Increment a variable with numeric and uppercase letter - php

Question

Can you tell me how I can increment a variable in PHP from 00 to ZZ ?
With A5, 8R, GG...
I tried this but it's just for letter :
for($i="AA"; $i<="ZZ" AND strlen($i)<=2; $i++)
Thank you

Answer 1

i created a little snippet that should demonstrate how you can use range($start,$end) to create what you are looking for
<?php
//create an array with all values from 0-9 and A-Z
$range = array_merge(range("0","9"),range("A","Z"));
//create counter-aray
$counter = array();
//loop through the range
foreach($range as $value1){
foreach($range as $value2){
$counter[] = $value1.$value2;
}
}
//show the counter
print_r($counter);
?>
result:
Array
(
[0] => 00
[1] => 01
[2] => 02
[3] => 03
[4] => 04
[5] => 05
[6] => 06
[7] => 07
[8] => 08
[9] => 09
[10] => 0A
[11] => 0B
[12] => 0C
[13] => 0D
[14] => 0E
[15] => 0F
[16] => 0G
[17] => 0H
[18] => 0I
[19] => 0J
[20] => 0K
[21] => 0L
.....many more values follow here
)
feel free to ask questions if you need further explaination

Answer 2

It actually sounds as if you are trying to add numbers in base 36. Since PHP can convert between bases, you could add the numbers in base 10 then convert into base 36.
for($i = 0; $i <= base_convert("zz", 36, 10); $i++) {
echo(str_pad(strtoupper(base_convert($i, 10, 36)), 2, "0", STR_PAD_LEFT) . PHP_EOL);
}
$i is an integer in base 10 that will loop from 0 to 1295. (zz in base 10.)
base_convert converts $i from base 10 to base 36.
strtoupper converts the resulting string to uppercase so you get AA instead of aa.
str_pad will add leading 0s to convert values such as 0 to 00.