opcache: Improve error messages when “temporarily enabling OPcache” #19619
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…eady active An easy way to accidentally enable OPcache “temporarily” is by using `php_admin_value[opcache.enable]=1` within a FPM pool’s configuration, since the `php_admin_value` settings mostly behave like settings in php.ini, with many OPcache INI settings being a notable exception. As long as OPcache is already enabled within php.ini (or simply by default), emitting a warning for `php_admin_value[opcache.enable]=1` or similar is going to be confusing, since is not actually temporarily enabling anything. A follow-up commit will also try to detect this kind of incorrect configuration and try to provide better advice for cases where OPcache is actually not yet enabled.
The error message will now advice on the `php_admin_value[opcache.enable]=1` mistake. It will also send the message to OPcache’s logging facility instead of the regular error handling logic during startup so that it will not be made available to `error_get_last()`, since it is related to a specific request and thus not actionable by a script either. php#19146 made a related change to `opcache.memory_consumption`.
TimWolla
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DanielEScherzer
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Aug 30, 2025
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