MOBA Challenger

<?php

$playerPool = [];

$input = readline();

while ($input !== 'Season end') {

    if (strpos($input, ' vs ') !== false) {
        list($player1, $player2) = explode(' vs ', $input);

        if (key_exists($player1, $playerPool) && key_exists($player2, $playerPool)) {
            foreach ($playerPool[$player1] as $role => $power) {
                if (key_exists($role, $playerPool[$player2])) {
                    if ($playerPool[$player1][$role] > $playerPool[$player2][$role]) {
                        unset($playerPool[$player2]);
                        break;
                    } elseif ($playerPool[$player2][$role] > $playerPool[$player1][$role]) {
                        unset($playerPool[$player1]);
                        break;
                    }
                }
            }
        }
    } else {
        list($player, $position, $skill) = explode(' -> ', $input);

        if (!key_exists($player, $playerPool)) {
            $playerPool[$player] = [];
        }
        if (!key_exists($position, $playerPool[$player])) {
            $playerPool[$player][$position] = 0;
        }
        if ($playerPool[$player][$position] < $skill) {
            $playerPool[$player][$position] = $skill;
        }
    }

    $input = readline();
}

foreach ($playerPool as $playerD => $skillD) {
    uksort($playerPool[$playerD], function ($key1, $key2) use ($skillD) {
        if ($skillD[$key2] === $skillD[$key1]) {
            return $key1 <=> $key2;
        }
        return $skillD[$key2] <=> $skillD[$key1];
    });
    $playerPool[$playerD]['totalSkill'] = 0;

    foreach ($skillD as $power) {
        $playerPool[$playerD]['totalSkill'] += $power;
    }
}

uksort($playerPool, function ($pl1, $pl2) use ($playerPool) {
    return $playerPool[$pl2]['totalSkill'] <=> $playerPool[$pl1]['totalSkill'];
});

foreach ($playerPool as $playerT => $skill) {
    echo $playerT . ": " . $playerPool[$playerT]['totalSkill'] . " skill" . PHP_EOL;
    unset($playerPool[$playerT]['totalSkill']);

    foreach ($playerPool[$playerT] as $skillName => $value) {
        echo "- $skillName <::> $value" . PHP_EOL;
    }
}