class.Collection.php

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<?php

namespace ILIAS\Awareness\User;

class Collection implements \Countable
{
    protected array $users = array();

    public function addUser(int $a_id): void
    {
        $this->users[$a_id] = $a_id;
    }

    public function removeUser(int $a_id): void
    {
        if (isset($this->users[$a_id])) {
            unset($this->users[$a_id]);
        }
    }

    public function getUsers(): array
    {
        return $this->users;
    }

    public function count(): int
    {
        return count($this->users);
    }
}