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<?php declare(strict_types=1); namespace Psl\Math; use function count; use function sort; /** * Returns the median of the given numbers in the list. * * Returns null if the given iterable is empty. * * @param list<int|float> $numbers * * @pure */ function median(array $numbers): ?float { sort($numbers); $count = count($numbers); if (0 === $count) { return null; } /** @psalm-suppress MissingThrowsDocblock */ $middle_index = div($count, 2); if (0 === $count % 2) { return mean( [$numbers[$middle_index], $numbers[$middle_index - 1]] ) ?? 0.0; } return (float) $numbers[$middle_index]; }