If you require to get all the records of current week using mysql query. for example you have one table "items" and columns are id, title, description, created_at and update_at, Now you want to get all records of this week. so you can fetch fields value using DATE_SUB and INTERVAL of mysql. In following example you can see how to select data of current week.
SELECT * FROM items WHERE created_at > DATE_SUB(NOW(), INTERVAL 1 WEEK);