I have a theoretical question.
I can\'t see any difference between declaring a function within a PHP file and creating a stored procedure in a dat
Some benefits include:
Maintainability: you can change the logic in the procedure without needing to edit app1, app2 and app3 calls.
Security/Access Control: it's easier to worry about who can call a predefined procedure than it is to control who can access which tables or which table rows.
Performance: if your app is not situated on the same server as your DB, and what you're doing involves multiple queries, using a procedure reduces the network overhead by involving a single call to the database, rather than as many calls as there are queries.
Performance (2): a procedure's query plan is typically cached, allowing you to reuse it again and again without needing to re-prepare it.
(In the case of your particular example, the benefits are admittedly nil.)