Usergroup.create read-only all hostgroup

[Meystin]

Hello,
I am writting a code to initialize my zabbix server.
I want to create a user group which can only read data from API.
How can i select all id when i use usergroup.create?
thank you
Part of my code:
$searchId = $this->_api->usergroupCreate(array(
"name" => "myGuest",
"rights" => array(
"id"=>'<select all group>',
"permission" => 2,
),
));