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<?php declare(strict_types=1); namespace Psl\Dict; use Psl; use Psl\Type; /** * Flips the keys and values of an iterable. * * In case of duplicate values, later keys will overwrite the previous ones. * * Examples: * * Dict\flip(['a' => 1, 'b' => 2, 'c' => 3]) * => Dict(1 => 'a', 2 => 'b', 3 => 'c') * * @template Tk of array-key * @template Tv of array-key * * @param iterable<Tk, Tv> $iterable * * @return array<Tv, Tk> */ function flip(iterable $iterable): array { $result = []; foreach ($iterable as $key => $value) { Psl\invariant( Type\array_key()->matches($value), 'Expected all values to be of type array-key, value of type (%s) provided.', gettype($value) ); /** @var Tv $value */ $result[$value] = $key; } return $result; }