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#php-fpm

3 stories

Banner: PHP app three times slower after a Docker image rebuild because OPcache was not enabled

Web Development Bug Report

PHP app 3x slower after a Docker image rebuild because OPcache was not enabled

Daniel Tran · May 15, 2025 · 7 min read

After moving our Symfony app to the official php-fpm image, median response time went from 38 ms to 121 ms with no code change. OPcache was never enabled in the new image, and checking it from the CLI hid the problem. Here is how we found it and tuned it.

Banner: PHP log file overflowing with null-to-string deprecation warnings

Web Development Bug Report

PHP 8.1+ log flood: Passing null to parameter of type string is deprecated

Daniel Tran · Dec 17, 2024 · 8 min read

After moving a PHP 7.4 app to PHP 8.3, our logs grew to 9 GB a day of null-to-string deprecation notices and filled a disk. We found the real call sites, fixed them by intent instead of blind casts, and blocked new ones in CI.

Banner: Nginx returning 502 Bad Gateway because of a PHP-FPM socket permission and pool size problem

Web Development Bug Report

Nginx 502 Bad Gateway with PHP-FPM: socket permission denied and pm.max_children

Daniel Tran · Oct 24, 2024 · 8 min read

After moving our PHP app to a new Ubuntu 24.04 server, every page returned 502 Bad Gateway. Fixing socket ownership got us online, then traffic spikes brought the 502s back from an undersized FPM pool. Here is how we fixed both.