<?php
declare(strict_types=1);

function recordVote(array $counts,string $choice): array {
    if (!array_key_exists($choice,$counts)) throw new InvalidArgumentException("Unknown choice");
    $counts[$choice]++;
    return $counts;
}
$counts = ["drill"=>0,"rake"=>0];
$counts = recordVote($counts,"drill");
$counts = recordVote($counts,"rake");
$counts = recordVote($counts,"drill");
echo json_encode($counts,JSON_THROW_ON_ERROR), "\n";
if ($counts !== ["drill"=>2,"rake"=>1]) throw new RuntimeException("Wrong tally");