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<?php use Carbon\Carbon; $suffixes = [ '1A', '2A', '3A', '4A', '5A', '6A', '7A', '8A', '9A', '9B', '9C', '9D', '9E', '9F', '9G', '9H', '9I', '9J', '9K', '9L', '9M', '9N', '9O', '9P', '9Q', '9R', '9S', '9T', '9U', '9V', '9W', '9X', '9Y', '9Z', ]; # echo count($suffixes); $inv = 'INV' . date('Y') . date('m') . '-' . $suffixes[0]; foreach ($suffixes as $k => $v) { $lastInv = explode('-', $inv); $nextSuffix = array_search($lastInv[1], $suffixes); echo $nextSuffix; # break; $nextInv = $lastInv[0] . '-' . $suffixes[(++$nextSuffix) % count($suffixes)]; echo $inv, PHP_EOL; }