I explain my problem :
The function role_assign is really heavy.
I made a development to enrol students automatically in their course spaces and groups (it's a synchronization with LDAP).
When I call the function role_assign (or role_unassign it's the same problem), to enrol 186 students in a group and in a context of a course, it takes 213 secs!

So, I tried to understand why before I post in this forum and I think I have a possible reason:
I duplicated the function role_assign in a personalized function called role_assign_iut and I just commented the lines :

/// Do some data validation

if (empty($roleid))

{ debugging('Role ID not provided'); return false; }

if (empty($userid) && empty($groupid))

{ debugging('Either userid or groupid must be provided'); return false; }

if ($userid && !record_exists('user', 'id', $userid))

{ debugging('User ID '.intval($userid).' does not exist!'); return false; }

if ($groupid && !groups_group_exists($groupid))

{ debugging('Group ID '.intval($groupid).' does not exist!'); return false; }

if (!$context = get_context_instance_by_id($contextid))

{ debugging('Context ID '.intval($contextid).' does not exist!'); return false; }

if (($timestart and $timeend) and ($timestart > $timeend))

{ debugging('The end time can not be earlier than the start time'); return false; }

So now, the execution time takes only 2secs!
I just commented these lines because I know my parameters are good, I checked them before the execution.

My questions are :
Why these params verifications takes so long?
Why are these verifications here?
Is it just to be sure the developers like me don't use bad params?

Regards,
MELIX Simon