Simple Docker Setup for PHP

docker-compose.yml

version: '3'

services:
    db:
      image: mysql:5.7
      restart: always
      environment:
        MYSQL_ROOT_PASSWORD: somewordpress
        MYSQL_DATABASE: wordpress
        MYSQL_USER: wordpress
        MYSQL_PASSWORD: wordpress
      volumes: 
        - "./database:/docker-entrypoint-initdb.d"
      ports:
        - "3307:3306"
    php:
      build: ./
      command: php -S 0.0.0.0:8000 /app/index.php
      ports: 
        - "8000:8000"
      volumes: 
        - .:/app
      

Dockerfile

FROM php:7.3.5-cli-stretch
RUN docker-php-ext-install mysqli