Adding PHP Extensions using Docker Compose

this is my code. its already running on my server.

web:
  image: nginx:latest
  ports:
    - "80:80"
  volumes:
  - ./code:/code
  - ./site.conf:/etc/nginx/conf.d/site.conf
  links:
    - php
php:
  #remove this
  #dockerfile: extensions
  #image: php:7-fpm
  #change with build ...
  build: './docker/php'
  volumes:
    - ./code:/code

Then, add Dockerfile file to the docker/php folder:

FROM php:7-fpm

RUN apt-get update && apt-get install -y \
        libicu-dev \
    && docker-php-ext-install \
        intl \
    && docker-php-ext-enable \
        intl

Now you can run Dockerfile inside docker-compose.

In your extensions file, add this to the top: FROM php:7-fpm

and remove the image: php:7-fpm from your docker-compose file