What code style to use for plugin and theme development for wordpress?

Question

WordPress

Themes and plugins are mostly for internal use. It is not necessary to support php versions lower than 5.4. I would also like to be able to upload plugins to wordpress.org and codecanyon.net.
I know there is https://make.wordpress.org/core/handbook/best-prac... But it's archaic and doesn't match psr.

Answer 1

To be able to publish plugins in the official Wordpress repository, you need to use what is recommended by the link you provided, this is not critical for codecanyon

Answer 2

Still use OOP. And see the primers of popular plugins.