LD_Groups_Membership::add_data_columns()
Method: Adds the assigned course columns for lessons and quizzes in the admin.
Method: Adds the assigned course columns for lessons and quizzes in the admin.
Function: Check if the user can complete the current step.
Method: Edit Post handler function.
Function: Utility function to check if Groups post type is hierarchical.
Filter Hook: Filters whether to allow access to the sample lesson or not.
Filter Hook: Filters the list of user group courses.