In my test, under the process based model, MINIT and MSHUTDOWN are only executed once.

[jmjoy]

https://github.com/phpinternalsbook/PHP-Internals-Book/blob/d23f273596cbcaafdcb1836a78126924e8c2d29b/Book/php7/extensions_design/php_lifecycle.rst#the-parallelism-models

In my test, under the process based model, MINIT and MSHUTDOWN are only executed once, just like the thread-based model.

[nikic]

I think this might be describing an apache prefork process model, which will do fork and then do MINIT, MSHUTDOWN. FPM will instead MINIT, then fork, and then MSHUTDOWN, which means there is only one MINIT, but there may be multiple MSHUTDOWN in forked processes.

The way I'd see this is that MINIT is executed once per process, but may also be replaced by a fork from an already-MINITed process.

[jmjoy]

I think this might be describing an apache prefork process model, which will do fork and then do MINIT, MSHUTDOWN. FPM will instead MINIT, then fork, and then MSHUTDOWN, which means there is only one MINIT, but there may be multiple MSHUTDOWN in forked processes.

The way I'd see this is that MINIT is executed once per process, but may also be replaced by a fork from an already-MINITed process.

1. I don't have apache environment
2. In my test, in the FPM mode, MINIT really executes once, and MSHUTDOWN will executes when worker process exits, if the pm of configuration is dynamic or ondemand.

I think the article should be more accurate.