Comment by toffer

If you search Github for "iphone sms" or "iphone messages", you can find lots of projects that will export your iPhone messages. So, if perl isn't your preferred language, there are plenty of other choices besides jwz's script.

I wrote an export script in Python that's fairly popular (200+ stars on Github): https://github.com/toffer/iphone-sms-backup

Unfortunately, I never did get around to exporting photos and videos.