About $ globals ['ecs']-> table?

$ ECs object definition database and table prefix

Class ECs {var $ db_name = ''; var $ prefix = 'ecs _ '; function ECS ($ db_name, $ prefix) {$ this-> db_name = $ db_name; $ this-> prefix = $ prefix;} function table ($ Str) {return '''. $ this-> db_name. ''. ''. $ this-> prefix. $ Str. ''';}

$ ECs = new ECS (test, test_cp _);

$ ECs-> table ('Identity _ approve') is combined into a table named test. test_cp_identity_approve.

Previously, I only knew that the query was written

Select * From test_cp_identity_approve where

It turns out that both the database name and the database name are available.
Select * from test. test_cp_identity_approve where

About $ globals ['ecs']-> table?