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<?php declare(strict_types=1); namespace Psl\Iter; use function is_countable; /** * Returns the number of elements an iterable contains. * * This function is not recursive, it counts only the number of elements in the * iterable itself, not its children. * * If the iterable implements Countable its count() method will be used. * * @template T * * @param iterable<T> $iterable * * @return int<0, max> */ function count(iterable $iterable): int { if (is_countable($iterable)) { /** @var int<0, max> */ return \count($iterable); } $count = 0; foreach ($iterable as $_) { ++$count; } return $count; }