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<?php declare(strict_types=1); namespace Psl\Vec; use Closure; use function array_filter; use function array_values; use function is_array; use const ARRAY_FILTER_USE_BOTH; /** * Returns a vec containing only the values for which the given predicate * returns `true`. * * The default predicate is casting the value to boolean. * * Example: * * Vec\filter_with_key(['a', '0', 'b', 'c']) * => Vec('b', 'c') * * Vec\filter_with_key( * ['foo', 'bar', 'baz', 'qux'], * fn(int $key, string $value): bool => $key > 1 && Str\contains($value, 'a') * ); * => Vec('baz') * * @template Tk * @template Tv * * @param iterable<Tk, Tv> $iterable * @param (Closure(Tk, Tv): bool)|null $predicate * * @return list<Tv> */ function filter_with_key(iterable $iterable, ?Closure $predicate = null): array { $predicate = $predicate ?? /** * @param Tk $_k * @param Tv $v */ static fn (mixed $_k, mixed $v): bool => (bool) $v; if (is_array($iterable)) { return array_values(array_filter( $iterable, /** * @param Tv $v * @param Tk $k */ static fn($v, $k): bool => $predicate($k, $v), ARRAY_FILTER_USE_BOTH )); } $result = []; foreach ($iterable as $k => $v) { if ($predicate($k, $v)) { $result[] = $v; } } return $result; }
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