How to upgrade WordPress website to php7.2

Whats the process for safely upgrading a WordPress website to a site to php7.2?

Full Article here:

- Why upgrade?
- WordPress no longer supporting any security issues with 5.6
- php7.2 and 7.3 are faster at handling requests
- better security

- minimising risks
- copy site to local flywheel local
- set site to php7.2
- view error log
- fix errors
- upload fixes to live site

- login to cpanel
- php version chooser