PHP 7.4:
$bus = fn(array $stops, int $riders = 0): int => array_reduce($stops, fn(int $count, array $data): int => ($count + $data[0]) - $data[1], $riders); var_dump($bus([[1, 0], [2, 1], [5, 3], [4, 2]])); //=> int(6)
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PHP 7.4: