Unique Sequencer

output.txt

"AAA"
"BAA"
"CAA"
"DAA"
"EAA"
"FAA"
"GAA"
"HAA"
"IAA"
"JAA"
"KAA"
"LAA"
"MAA"
"NAA"
"OAA"
"PAA"
"QAA"
"RAA"
"SAA"
"TAA"
"UAA"
"VAA"
"WAA"
"XAA"
"YAA"
"ZAA"
"ABA"
"BBA"
"CBA"
"DBA"
"EBA"
"FBA"
"GBA"

unique-sequencer.php

<?php
class UniqueSequencer {

  private static int $counter = -1;

  static private function char(int $num)
  {
    return chr(65 + $num);
  }

  static public function value(): string {
    self::$counter++;

    return
      self::char(self::$counter % 26) .
      self::char(floor(self::$counter / 26) % 26). 
      self::char(floor(self::$counter / 676) % 26);
  }
  
  static public function betterValue(): string {
    return strrev(self::value());
  }
}

for($i = 1; $i <= 100; $i++)
{
  dump(UniqueSequencer::prefix());
}