What modules are responsible for what in php?

Question

linux

as I understand it - if you install just php7 without the installed php7.0-mysql module - the functions of connecting to the database on mysql (and mariadb) will not work, and requests to them will not be sent, right?
without php7.0-curl - php functions with curl will not work..
why do you need php-fpm? Without it, PHP pages won't work at all? was it also in php version 5?
Is there a specific reference to php7 modules so that it is briefly written about each module, why is it needed?

Answer 1

there is php-fpm on the toaster.
Explain how php-fpm works?
Through the package manager, look for what php packages are and there will be an output in the form of a package description