Function: Retrieves all the tags from every person and removes duplicates.

Function: Retrieve alternate ID if it exists.

Function: Checks if a person has an active restriction with 99 severity.

Function: Checks whether the given email exists.

Function: Function for retrieving a person’s uploaded school photo.

Function: Retrieve requested field from person table based on user’s id.

Function: Retrieves a list of roles from the roles table.

Function: Retrieves person data given a person ID or person array.

Function: Checks whether the given username exists.