function eloCalc ($ratingA, $ratingB, $winner) {
  $qA = 10^($ratingA/400);
  $qB = 10^($ratingB/400);

  $expectedA = $qA / ($qA + $qB);
  $expectedB = $qA / ($qA + $qB);
  if ($winner == 1) { $scoreA = 1; $scoreB = 0; }
  else { $scoreA = 0; $scoreB = 1; }

  $newRatingA = $ratingA + ($c * ($scoreA - $expectedA));
  $newRatingB = $ratingB + ($c * ($scoreB - $expectedB));
return whatever
}