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I think my question fits into the same topic.
What mechanism does this forum (at xoops.org) use for making PDFs?
(I've tried TCPDF, the apparent successor to FPDF, but it has some issues. One of the problems is that the PDFs it makes are images, which precludes the ability to search for text within the PDF. The PDF feature used at xoops.org does not seem to have this limitation.)