PHP - 根据订阅包限制用户的发票数量

Question

i'm building this CRM system which providing small business owners to manage their clients & billing.

on my system there is 3 subscription packages

1. Free (30 days)
2. Gold (1 year)
3. Silver (6 months)

free - free package is available for users with no price & users on this package will be able to manage 3 clients & 12 invoices.

Gold - gold users package is a paid one & users on gold package will be able to manage unlimited clients & invoices.

Siliver - paid package, 50 clients & 100 invoices

what i need to know is how can i limit the number of invoices & clients created by a user using php & MYSQL

i would like if some one can explain me in detals.

Help appreciated.

Answer 1

Well, whenever a user clicks on the 'create new invoice' or 'create new client' button, you count how many exist already. If more than allowed, tell the user he needs to upgrade.