battle.php

<?php

    public function battleResult(string $good, string $evil): string
    {
        $good = $this->getFormattedResult($good);
        $evil = $this->getFormattedResult($evil);

        if ($good > $evil) {
            return 'Battle Result: Good triumphs over Evil';
        }

        if ($evil > $good) {
            return 'Battle Result: Evil eradicates all trace of Good';
        }

        return 'Battle Result: No victor on this battle field';
    }

    private function getFormattedResult(string $score): int
    {
        return array_sum(array_map(static fn(string $part) => (int) $part, explode(' ', $score)));
    }