Add a `./configure` flag to completely disable registerExtension?

[TysonAndre]

Summary

Because snapshots are incompatible with extensions, there should be a way to prevent PHP from using extensions, completely.

https://github.com/phpv8/v8js#snapshots

snapshots are incompatible with extensions

My use case:

• A website using long-running httpd processes. This is capable of running code from different branches of the same codebase. Some of the branches may be older, and continue to call V8Js->registerExtension(). There's no limit on how old the branches can be

  I want to start using createSnapshot. I'm fine with very old branches not working, but don't want the new branches to crash or break.

  So I can check `if (method_exists($v8js, 'registerExtension')) { code using extension } else { code using snapshot; }

[stesie]

This likely will not work as you want it to, at least if you set auto_enable.

Depending on the PHP SAPI you use multiple requests will be served by one PHP process; if the first request is handled by a legacy one, then registerExtension will happily add it. If the next request goes to a new application version that one will auto-enable the extension, yet initialize with a snapshot.