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Re:Show HN: FrankenPHP, an app server for PHP written in Go by marcofatica on Friday October 14, 2022 @12:56PM (#33206052)
They're probably using PHP's built in opcache or something they rolled themselves

  OPcache improves PHP performance by storing precompiled script bytecode in shared memory
https://www.php.net/manual/en/intro.opcache.php
Re:Show HN: FrankenPHP, an app server for PHP written in Go by chx on Friday October 14, 2022 @01:08PM (#33206213)