How can php and mysql be reached in a docker container?

Question

Docker

snippet docker-compose.yml

services:
    web:
        image: debian.loc
        volumes:
            - .:/app
        links:
            - php
    php:
        image: php:7.3-fpm
        volumes:
            - .:/app
        ports:
            - "9000:9000"

debian.loc image Dockerfile

FROM debian:9.3
RUN apt-get install nginx-full

after starting the container docker-compose up -d and entering it docker-compose exec web bash
I enter nginx -v # gives out the version of nginx
I enter php -v # php is not installed
Tell me, maybe something needs to be registered, how to do it from the container could you run php?

Answer 1

Of course, there is no php in the web container - it is in the php container
. But, probably, there is no bash there and there is no option to go inside the container - only php.