How to test kirby in a sub folder?

The CMS Questions
1

Hello there.

I built a site for a client (can not show it NDA) on local via herd the layout is perfect, but on the server there is a shift in loading and layout, after that its okay.

So I want to test the installation on in a subfolder to experiment.

I have changed the .htaccess to Rewritebase /testfolder

but when I go to mysite.com/testfolder

it states:

This page is currently offline. We are very sorry for the inconvenience and will fix it as soon as possible.

Advice for developers and administrators:
Change the PHP version to one supported by your version of Kirby

I am unsure what to do.

2

Don’t know how the server handles PHP versions, maybe per domain, so you would have to change it for this subfolder, or maybe better still assign a subdomain to this testfolder and change the PHP version accordingly.