$engine = \Gini\BPM\Engine::of('camunda');
$instance1 = $engine->process('invoice')->start(['refNo'=>'01923019283']);
$instance2 = $engine->processInstance($instance1->id); // 'd1085971-882d-11e6-819e-0242ac112a06'
if ($instance->exists()) {
}

//search tasks
$o = $engine->searchTasks(['process'=>'order-review', 'group' => 'school-of-chemistry']);
$tasks = $engine->getTasks($o->token, 0, 10);

//get a task
$task = $engine->task('1234-5678-9012');
$task->setAssignee('jia.huang');
$task->claim('jia.huang');
$task->unclaim();

//complete a task
$task->complete(['foo'=>'bar']);

//add a comment for a task
$task->addComment('comment');

//get comments for a task
$task->getComments()

//search groups
$o = $engine->searchGroups(['type' => 'order-review-process']);
$groups = $engine->getGroups($o->token);

//create a group
$engine->group()->create(['id' => 'school-of-chemistry', 'name' => '化工学院', type => 'order-review-process']);

//get group by ID
$group = $engine->group('school-of-chemistry');

//update group
$group->update(['id' => 'school-of-chemistry', 'name' => '化工学院', type => 'order-review-process']);

//delete group
$group->delete();

//get group's members
$group->getMembers();

//add a member to the group
$group->addMember('user_id');

//remove a member from a group
$group->removeMember('user_id');

//search users
$o = $engine->searchUsers(['name' => 'Demo']);
$users = $engine->getUsers($o->token);

//create a user
$engine->user()->create(['id' => 1, 'firstName' => 'demo', 'lastName' => 'Genee', 'email' => '[email protected]', 'password' => 'password']);

//get user by ID
$user = $engine->user(1);

//update user
$user->update(['id' => 1, 'firstName' => 'demo', 'lastName' => 'Genee', 'email' => '[email protected]']);

//delete user
$user->delete();

//change user's password
$user->changePassword('password', 'newpassword');