No, thats done in the next line (php_mongo_api_insert_start()).
We only save the current request_id here so we can return it.

Changing the way its (post/pre) increment is tricky, and actually may currently be wrong (due to different amount of commands executed by mcon today then when the initial value was picked).
Thats something I will be looking at later during refactoring if I get the time, but as it stands this code is correct