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array-filter-arrow-functions.php
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array-filter-arrow-functions.php
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<?php // lint >= 7.4
namespace ArrayFilter;
use function PHPStan\Testing\assertType;
/**
* @param int[] $list1
* @param int[] $list2
* @param int[] $list3
*/
function alwaysEvaluatesToFalse(array $list1, array $list2, array $list3): void
{
$filtered1 = array_filter($list1, static fn($item): bool => is_string($item));
assertType('array{}', $filtered1);
$filtered2 = array_filter($list2, static fn($item): bool => is_string($item), ARRAY_FILTER_USE_KEY);
assertType('array<int>', $filtered2); // not supported yet
$filtered3 = array_filter($list3, static fn($item, $key): bool => is_string($item) && is_string($key), ARRAY_FILTER_USE_BOTH);
assertType('array<int>', $filtered3); // not supported yet
}
/**
* @param array<int|string, int|string> $map1
* @param array<int|string, int|string> $map2
* @param array<int|string, int|string> $map3
*/
function filtersString(array $map1, array $map2, array $map3, array $map4): void
{
$filtered1 = array_filter($map1, static fn($item): bool => is_string($item));
assertType('array<int|string, string>', $filtered1);
$filtered2 = array_filter($map2, static fn($item): bool => is_string($item), ARRAY_FILTER_USE_KEY);
assertType('array<int|string, int|string>', $filtered2); // not supported yet
$filtered3 = array_filter($map3, static fn($item, $key): bool => is_string($item) && is_string($key), ARRAY_FILTER_USE_BOTH);
assertType('array<int|string, int|string>', $filtered3); // not supported yet
}