$dbUserManager = new DbUser($dbConnection);

$dbUserManager->createUser('test_username', '!super_secure_password$');

$dbUserManager->dropUser('test_username');

$dbUserManager->userExist('test_username');

$dbUserManager->grantPrivileges(
    'test_username',
    [
        DbUser::PRIVILEGE_CREATE_USER,
        DbUser::PRIVILEGE_CREATE,
        DbUser::PRIVILEGE_GRANT_OPTION,
        DbUser::PRIVILEGE_ALTER,
        DbUser::PRIVILEGE_FILE,
        DbUser::PRIVILEGE_RELOAD,
        DbUser::PRIVILEGE_SELECT,
        DbUser::PRIVILEGE_INSERT,
        DbUser::PRIVILEGE_UPDATE,
        DbUser::PRIVILEGE_DELETE,
    ]
);

$dbUserManager->grantPrivileges(
    'test_username',
    [
        DbUser::PRIVILEGE_SELECT,
        DbUser::PRIVILEGE_INSERT,
        DbUser::PRIVILEGE_UPDATE,
        DbUser::PRIVILEGE_DELETE,
    ],
    'test_database_name'
);

$dbUserManager->grantPrivileges(
    'test_username',
    [
        DbUser::PRIVILEGE_SELECT,
        DbUser::PRIVILEGE_INSERT,
        DbUser::PRIVILEGE_UPDATE,
        DbUser::PRIVILEGE_DELETE,
    ],
    'test_database_name',
    'test_table_name'
);

$dbUserManager->revokePrivileges(
    'test_username',
    [
        DbUser::PRIVILEGE_CREATE_USER,
        DbUser::PRIVILEGE_CREATE,
        DbUser::PRIVILEGE_GRANT_OPTION,
        DbUser::PRIVILEGE_ALTER,
        DbUser::PRIVILEGE_FILE,
        DbUser::PRIVILEGE_RELOAD,
        DbUser::PRIVILEGE_SELECT,
        DbUser::PRIVILEGE_INSERT,
        DbUser::PRIVILEGE_UPDATE,
        DbUser::PRIVILEGE_DELETE,
    ]
);

$dbUserManager->revokePrivileges(
    'test_username',
    [
        DbUser::PRIVILEGE_SELECT,
        DbUser::PRIVILEGE_INSERT,
        DbUser::PRIVILEGE_UPDATE,
        DbUser::PRIVILEGE_DELETE,
    ],
    'test_database_name'
);

$dbUserManager->revokePrivileges(
    'test_username',
    [
        DbUser::PRIVILEGE_SELECT,
        DbUser::PRIVILEGE_INSERT,
        DbUser::PRIVILEGE_UPDATE,
        DbUser::PRIVILEGE_DELETE,
    ],
    'test_database_name',
    'test_table_name'
);

$dbUserManager->flushPrivileges();