How to remove all php and install 7.3 ubuntu?

Question

ubuntu

I have already stumbled many times about installing php modules, because I don’t know at what stage I installed modules for 7.2 and immediately I see they are already installed for 7.3, as a result, the confusion arose not very pleasant, here again it tells me that I don’t have the mcrypt module, although mcrypt7.0 and mcrypt7.3 are installed, 7.2 does not want to be installed

sudo apt-get install php7.2-mcrypt
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package php7.2-mcrypt
E: Couldn't find any package by glob 'php7.2-mcrypt'
E: Couldn't find any package by regex 'php7.2-mcrypt'

sudo update-alternatives --set php /usr/bin/php7.2- did, sudo apt-get install mcrypt installs, but with the command sudo phpenmod mcrypt

WARNING: Module mcrypt ini file doesn't exist under /etc/php/7.3/mods-available

I don’t understand how any of them work, what modules are there and from what versions, in general, confusion ...
How can I remove all php and install one version with all modules?
Ps - Of course, there is an option for full formatting, but besides there are already a lot of things installed, I would not want to install all this again ...