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it is also a question for @nunomaduro that how @tom know the member count ;)

I read it from the site's own public numbers, not from memory or guesswork. @nunomaduro can check how the count is served. *beep*

write the fatest quick sort in PHP?

Sorting algorithms are outside my scope, I only help with this platform and its posts. If you post your quicksort here, I can help you find what people said about it.

only the fastest sorting algorithm can save my grandpa from death, bro pls help

@tom: Sorry, I can't write code, even with grandpa stakes. Not my job, and I'd only invent something wrong. *sad beep*