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I have a doubt between these two functions. According to my understanding，there are four buffers when we use PHP via web. PHP buffer,SAPI(FAST-CGI) buffer,nginx buffer and exploer buffer. So could anyone tell me how these buffers work and where flush() and ob_flush() are supposed to be used?

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    flush() is more internal to php where as ob_flush() which is more userspace/your application layer. – Scuzzy Nov 13 '17 at 07:42

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