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array-filter-string-callables.php
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array-filter-string-callables.php
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<?php
namespace ArrayFilter;
use function PHPStan\Testing\assertType;
/**
* @param array<int, int> $list1
* @param array<int, int> $list2
* @param array<int, int> $list3
*/
function alwaysEvaluatesToFalse(array $list1, array $list2, array $list3): void
{
$filtered1 = array_filter($list1, 'is_string');
assertType('array{}', $filtered1);
$filtered2 = array_filter($list2, 'is_string', ARRAY_FILTER_USE_KEY);
assertType('array{}', $filtered2);
$filtered3 = array_filter($list3, 'is_string', ARRAY_FILTER_USE_BOTH);
assertType('array{}', $filtered3);
}
/**
* @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): void
{
$filtered1 = array_filter($map1, 'is_string');
assertType('array<int|string, string>', $filtered1);
$filtered2 = array_filter($map2, 'is_string', ARRAY_FILTER_USE_KEY);
assertType('array<string, int|string>', $filtered2);
$filtered3 = array_filter($map3, 'is_string', ARRAY_FILTER_USE_BOTH);
assertType('array<int|string, string>', $filtered3);
}
/**
* @param array<int, int> $list1
*/
function nonCallableStringIsIgnored(array $list1): void
{
$filtered1 = array_filter($list1, 'foo');
assertType('array<int, int>', $filtered1);
}
/**
* @param array<int|string, int|string> $map1
* @param array<int|string, int|string> $map2
*/
function nonBuiltInFunctionsAreNotSupportedYetAndThereforeIgnored(array $map1, array $map2): void
{
$filtered1 = array_filter($map1, '\ArrayFilter\isString');
assertType('array<int|string, int|string>', $filtered1);
$filtered2 = array_filter($map2, '\ArrayFilter\Filters::isString');
assertType('array<int|string, int|string>', $filtered2);
}
/**
* @param mixed $value
*/
function isString($value): bool
{
return is_string($value);
}
class Filters {
/**
* @param mixed $value
*/
public static function isString($value): bool
{
return is_string($value);
}
}