Creating a function which you then attach to a filter hook is much more efficient than creating a whole new template file for the new code; however. Creating a function which you then attach to a filter hook is much more efficient than creating a whole new template file for the new code; however. Creating a function which you then attach to a filter hook is much more efficient than creating a whole new template file for the new code; however.Creating a function which you then attach to a filter hook is much more efficient than creating a whole new template file for the new code; however.Creating a function which you then attach to a filter hook is much more efficient than creating a whole new template file for the new code; however.