nginx - what's the difference PHP-FPM , Opcache and APC -


i use nginx fast cgi cache settings , it's working great read around internet opcache , apc . don't understand difference between them , fpm , why people use them when cache fpm easier adding few sentences nginx conf . use these setting reference 

fastcgi_cache microcache; fastcgi_cache_key $scheme$host$request_uri$request_method; fastcgi_cache_valid 200 302 1d; fastcgi_cache_valid 400 500 504 404 1m;

if can explain in details differences .


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