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This needs to be said, and this language cannot be saved.
Just point Claude at your PHP and ask it to rewrite it in Rust. I know it seemed crazy when Bun did it (and it probably was), but it actually works now. (And please try it before you say "that's what people said 6 months ago" or whatever.)
I get how this sounds if you haven't used it very recently. There's no way I'd trust Opus 5.0 with that task.
That forum software is around $500/year (if you want your own branding which I assume they do).
To be fair that is more reasonable than I expected, but still... PHP.