EloCalculator.php

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<?php
 
namespace ComusParty\App;

class EloCalculator
{
    const K_FACTOR = 16;

    public static function calculateNewElo(int $eloPlayer, float $averageElo, float $result): float
    {
        return $eloPlayer + self::K_FACTOR * ($result - self::getExpectedScore($eloPlayer, $averageElo));
    }

    protected static function getExpectedScore(int $eloPlayer, float $averageElo): float
    {
        return 1 / (1 + pow(10, ($averageElo - $eloPlayer) / 400));
    }
}