That is *all* the crazy.
Hydrogen is very very deprecated and non-active... To be honest I'd be a bit scared to dive back into that codebase. I'd recommend downgrading PHP on that machine if you have no other choice but to keep running it. If that's not an option... hmm. Just based on that string above it might be worth it to look at your encoding settings? I haven't touched PHP for anything more than light maintenance in quite a few years, so my rust is thick.