XF 2.2 Minimum requirements

[the1]

I currently have an instance of 2.2.13 on my server and I am looking to migrate to a new server I have recently purchased.

The minimum requirements on the Xenforo purchase page says that PHP 8.2 is recommended. My question is, is it okay to run on PHP 8.3?

Additionally, the minimum requirements states common PHP functions are required. Is there a list of what these are?

 

[ENF]

My question is, is it okay to run on PHP 8.3?

Depends. You're on 2.2.13, which has decent moderate compatibility with 8.3, but Xenforo was updated a few times after that with more PHP fixes. I would recommend to update to a more recent version to reduce the chance for issues. When 2.2.13 was released, PHP 8.0 was the recommendation.

Is there a list of what these are?

If you are running 2.2.13, then the same configuration would work.
But, here's a list anyway (see PHP extensions)

For good effort, I'll snip a quote from @Chris D that he posted today:

But, yeah, strongly recommend upgrading to XenForo 2.3 at this point. That has full compatibility with PHP 8.2 and 8.3 and will also support the upcoming PHP 8.4 in the near future.