How to do it safely.
BEFORE ANYTHING
Take a full backup.
CHECK COMPATIBILITY
Confirm your application, theme and plugins support the target version.
WordPress Site Health flags known problems.
HOW TO CHANGE IT
cPanel, PHP selector. Choose the version and apply.
The change takes effect immediately.
WHAT TO TEST AFTERWARDS
Every page type: homepage, a post or product, a category, the contact page
Forms, and confirm notifications arrive Login to any admin area The checkout, if you have one Anything interactive
CHECK THE ERROR LOG
Even if the site appears fine. Warnings there indicate future problems.
IF SOMETHING BREAKS
Change back immediately. The site works again.
Then identify the offending component.
HOW TO IDENTIFY IT
The error log names the file. That tells you which plugin, theme or custom code is responsible.
MOVING UP GRADUALLY
If a large jump breaks things, move up one version at a time.
