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I've done some research on most of the web services currently on the market, please find below the APIs that I feel are worth mentioning on this thread, in an order based on price/value ratio. Plus, by outsourcing this process you unburden your own infrastructure/backend and - provided you are using a reputable service - ensure compatibility with adjusting web standards, uptime, short processing times and quick content delivery. In terms of cost, using a web-service (API) may in many cases be the more sensible approach. Unfortunately, that's the best I've come up with.
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Not quick enough (by far) for a real-time download unfortunately and the memory usage puts the memory usage ratio in the order of 1000-to-1 (600M of RAM for a 70k file), which is utterly ridiculous. My 70k file takes approximately 5 minutes and at least 500-600M of RAM to create a 35 page PDF file. Perhaps that took me over (although nearly 50% bloat seems odd). The only reason I can guess as to why I hit this problem is that html2pdf does a conversion into xhtml as part of the process.
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Now the astute reader may have noticed that my HTML file is smaller than 100k. max_execution_time = 600 # yes, 10 minutes.memory_limit = 1024M # yes, one gigabyte and.pcre.backtrack_limit = 2000000 # probably more than I need but that's OK.It requires the following php.ini settings: So I have a 70k HTML file to turn into PDF. At least if an error had been raised and logged you'd have some indication of what happened, why and what to change to fix it. What's horrifying about this is that when the limit is exceeded, the replace just silently fails. Why such a low value? Again, no idea.Ī bug was raised against PHP 5.2.1 for this, which is still open almost two years later. What this config parameter does is limits the string length for which matching is done.
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PHP 5.2.1 introduced a php.ini config directive called pcre.backtrack_limit. Basically, PHP 5.1.x worked fine with regex replaces (preg_replace_*) on strings of any size. HTML2PDF looked the most promising but I kept having this weird error about null reference arguments to node_type. DOMPDF did a terrible job with tables, borders and even moderately complex layout and htmldoc seems reasonably robust but is almost completely CSS-ignorant and I don't want to go back to doing HTML layout without CSS just for that program. What am I missing, or how can I resolve this issue?Īfter some investigation and general hair-pulling the solution seems to be HTML2PDF.
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I tried a Windows app called Html2Pdf Pilot that actually did a pretty decent job but I need something that at a minimum runs on Linux and ideally runs on-demand via PHP on the Webserver.
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