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<?php declare(strict_types=1);
namespace Pitchart\Phlunit\Constraint\Arrays;
use PHPUnit\Framework\Constraint\Constraint;
class ContainsNoDuplicateItem extends Constraint
{
protected function matches($other): bool
$other = ArrayUtility::toArray($other);
return \count($this->deduplicate($other)) === \count($other);
}
/**
* @return (mixed|null)[]
*
* @psalm-return non-empty-list<mixed|null>
*/
private function deduplicate(array $array): array
$unique = [];
do {
$element = \array_shift($array);
$unique[] = $element;
$array = \array_udiff(
$array,
[$element],
function($first, $second) {
return $first <=> $second;
);
} while (\count($array) > 0);
return $unique;
* @return string
public function toString(): string
return 'contains no duplicate item';
pitchart /
phlunit
