opcache: Disallow changing opcache.memory_consumption when SHM is set up
#19146
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This is necessary for phpdbg, which runs multiple startup/shutdown cycles in the same process.
…et up Normally changing the INI value is not possible after SHM is set up, since it is `PHP_INI_SYSTEM`. FPM is a notable exception: SHM is set up in the master process, but when spawning the individual pools, the `php_admin_value` config option can be used to change `PHP_INI_SYSTEM` INIs on a per-pool basis. This does not work for this option, since it will only be read on early start, leading to misleading PHPInfo output, since the INI value appears to be successfully set and since some of the calculated values are derived from the INI value rather than the actual value.
TimWolla
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Normally changing the INI value is not possible after SHM is set up, since it is
PHP_INI_SYSTEM. FPM is a notable exception: SHM is set up in the master process, but when spawning the individual pools, thephp_admin_valueconfig option can be used to changePHP_INI_SYSTEMINIs on a per-pool basis. This does not work for this option, since it will only be read on early start, leading to misleading PHPInfo output, since the INI value appears to be successfully set and since some of the calculated values are derived from the INI value rather than the actual value.