3v4l.org

run code in 300+ PHP versions simultaneously
<?php function sequenceAlphaNumeric($code, $count = 1) { $strLength = strlen($code); $base10 = base_convert($code, 36, 10); var_dump($code, $base10);die; $result = base_convert((int) $base10 + $count, 10, 36); $result = str_pad($result, $strLength, '0', STR_PAD_LEFT); $result = strtoupper($result); return $result; } echo sequenceAlphaNumeric('09');
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(2) "09" string(1) "9"

preferences:
190.7 ms | 403 KiB | 198 Q