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<?php declare(strict_types=1); namespace Psl\Collection; /** * The interface for all keyed collections to enable access its values. * * @template Tk of array-key * @template Tv */ interface IndexAccessInterface { /** * Returns the value at the specified key in the current collection. * * @param Tk $k * * @throws Exception\OutOfBoundsException If $k is out-of-bounds. * * @return Tv * * @psalm-mutation-free */ public function at(string|int $k): mixed; /** * Determines if the specified key is in the current collection. * * @param Tk $k * * @psalm-mutation-free */ public function contains(int|string $k): bool; /** * Returns the value at the specified key in the current collection. * * @param Tk $k * * @return Tv|null * * @psalm-mutation-free */ public function get(string|int $k): mixed; }
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