PHP buffer ob_flush() vs. flush() -

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what's difference between ob_flush() , flush() , why must call both?

the ob_flush() reference says:

this function send contents of output buffer (if any).

the flush() reference says:

flushes write buffers of php , whatever backend php using (cgi, web server, etc).

however, continues say:

[it] may not able override buffering scheme of web server…

so, seems me use ob_flush() of time. however, strange results when that. explain in simple terms what's going on here?

ob_flush sends application-initiated buffer. there may multiple nested ob_start()'s in php script. ob_flush passes current content upper layer.

php might (at own discretion) buffer output. depends on back-end. fastcgi has socket buffer on own. therefore flush() needs invoked send current content web server.

and web server might implement buffering scheme (mod_deflate or content filter), have no influence over. seldom, needs configured specifically.

anyway, use both.


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