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You're right that the back-end often gets ported to some other language when a PHP app is scaled-up; this goes with my point that when you move away from spitting out web pages, another language is a better choice.

I'm not sure your point about a database is valid; Python and Ruby and Perl apps are all using a shared database (or newer k-v store) as well.

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My point is that it's the place where all shared state is kept. "Shared nothing" is a lie because it's sweeping the sharing under the rug of the database.

I agree that most web stuff written in scripting languages is built around a database for shared state. But in more powerful languages, you have other options.

Never claimed Python/Ruby solve this problem, just that PHP doesn't (but is claimed to).

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