OPcache keeps compiled bytecode in shared memory, which is empty after every restart — so the first requests following a deploy or an FPM reload each pay full…
OPcache has shipped with PHP since 5.5 and is disabled in several distribution builds, which means a good number of production servers are compiling every file on every…
A deploy finishes, the files on disk are correct, and the site serves the previous release for another minute. OPcache is not checking whether a file changed on…
APC did two unrelated jobs: it cached compiled opcodes, and it offered a shared-memory key/value store to application code. PHP 5.5 bundles Zend OPcache and takes the first…
5.3 stops getting security fixes in August. Deprecations first, then the behaviour changes, then the version bump — and an APC replacement that ignores every setting you tuned.