class.ilAbstractUsersGalleryUserCollectionSorter.php

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<?php

declare(strict_types=1);

abstract class ilAbstractUsersGalleryUserCollectionSorter implements ilUsersGalleryUserCollectionSorter
{
    abstract protected function compare(ilUsersGalleryUser $left, ilUsersGalleryUser $right): int;

    final public function sort(array $users): array // Missing array type.
    {
        uasort($users, function (ilUsersGalleryUser $left, ilUsersGalleryUser $right): int {
            return $this->compare($left, $right);
        });

        return $users;
    }
}