LDLMS_Course_Steps::get_parent_step_id( int $step_post_id, string $ancestor_step_type = '' )
Returns the parent step ID for a given step. 0 if no parent step.
LDLMS_Course_Steps::get_parent_step_id( int $step_post_id, string $ancestor_step_type = '' )
Returns the parent step ID for a given step. 0 if no parent step.