Test task Mirafox

index.php

<?php
/**
 * @param array $c
 * @return array
 */
function averageNumberOfGoals($c)
{
    $games = $c['games'];
    $scored = $c['goals']['scored'];
    $skiped = $c['goals']['skiped'];

    return array(
        'scored' => $scored / $games,
        'skiped' => $skiped / $games
    );
}

/**
 * @param array|null $c1
 * @param array|null $c2
 * @return array|boolean
 */
function match($c1 = null, $c2 = null)
{
    if (!$c1 or !$c2) return false;

    // команды 1: cреднее забивание и пропускание голово за все игры
    $res = averageNumberOfGoals($c1);
    $c1_scored = $res['scored'];
    $c1_skiped = $res['skiped'];

    // команды 2: cреднее забивание и пропускание голово за все игры команды 1
    $res = averageNumberOfGoals($c2);
    $c2_scored = $res['scored'];
    $c2_skiped = $res['skiped'];

    $h = $c1_scored * $c2_skiped;
    $g = $c2_scored * $c1_skiped;

    $xh = ($h + 1) / ($h + $g);
    $xg = ($g + 1) / ($h + $g);

    $c1 = abs(round($h * $xh + 0.2));
    $c2 = abs(round($g * $xg - 0.2));
    return array($c1, $c2);
}