ApiPlatform\Core\Bridge\Doctrine\Orm\Filter\SearchFilter::normalizeValues PHP Method

    protected function normalizeValues(array $values) : array
    {
        foreach ($values as $key => $value) {
            if (!is_int($key) || !is_string($value)) {
                unset($values[$key]);
            }
        }
        return array_values($values);
    }