Intermittent failures of gettext() with php-fpm

[editorassistant]

Description

The following code:

<?php
echo setlocale(LC_MESSAGES, 'de_DE.UTF-8');
bindtextdomain('edas', '/mnt/edas/html/locale');

echo _("Good morning");

The page will sometimes generate the correct result, sometimes just produce the key - without any code or .mo changes. Restarting php-fpm or apache (or rebooting) does not help. The Linux function gettext shows the correct result.

PHP Version

PHP 8.2.9

Operating System

AWS Linux 2 (Centos)

[bukka]

I don't see anything FPM specific here. Seems more gettext related...

[bukka]

This also needs more info providing complete steps how to recreate this including your localization file(s) and used php configuration (php ini and fpm config). Also check if fpm pool users have right permissions to read your locale files.

[editorassistant]

Please note that this is completely random, i.e., just reloading the page randomly either succeeds (shows the translation) or fails (shows the key). No changes in file permissions, PHP code, .mo gettext file, web server, fpm, ini files, or anything else. If this were a file permission or ini file issue, it would presumably fail consistently, not randomly. Indeed, this seems more likely to be gettext related - maybe a race condition or some caching issue. (This is happening on a dev server, i.e., with no production traffic.)

I just noticed that this seems to be php-fpm instance dependent. For example, if there are two php-fpm processes spawned by httpd, it appears that one will consistently show the correct result, the other consistently the wrong one. I have not tried it with more than two php-fpm processes.