Max Product Of Three

PHP Max Product Of Three

function maxProductOfThree(array $a): int
{
    sort($a);
    $c = count($a);

    return max($a[$c - 1] * $a[$c - 2] * $a[$c - 3], $a[0] * $a[1] * $a[$c - 1]);
}

This checks the useful extremes, because the best product can come from either the three largest numbers or two negatives plus one large positive.