Function: Get the user profile photo ID

Filter Hook: Filter the profile photo id returned by dozent_get_profile_photo_id();

Function: Add an instructor to a course

Action Hook: Action hook before attach an instructor to a specific course

Action Hook: Action hook after attach an instructor to a specific course

Function: Detach / delete an instructor from the course instructors list.

Action Hook: Action hook before detach an instructor from a course

Action Hook: Action hook after detach an instructor from a course

Function: Check if an instructor attached with a course

Function: Get all instructor attached in a course