web:
   image: php:7.2-apache
   environment:
     - ALLOW_OVERRIDE=true
   ports:
     - "80:80"
   links:
     - db
   volumes:
     - ./app:/var/www/html/

db:
  image: mariadb
  restart: always
  volumes:
    - ./mysql:/var/lib/mysql
  environment:
    MYSQL_ROOT_PASSWORD: root
    MYSQL_USER: admin
    MYSQL_PASSWORD: test
    MYSQL_DATABASE: database
  ports:
    - "3306:3306"

phpmyadmin:
  image: phpmyadmin/phpmyadmin:latest
  links:
    - db
  ports:
    - 8888:80
  environment:
    MYSQL_USER: admin
    MYSQL_PASSWORD: test
    MYSQL_DATABASE: database

<?php
    $host='localhost:8888';
    $username="admin";
    $password="";
    $database="database";
    $conn=mysqli_connect($host,$username,$password,$database);
?>

FROM php:7.2-apache
RUN docker-php-ext-install pdo_mysql

web:
   build: .

try{
    $db = new pdo('mysql:host=db:8889;dbname=database', 'root', 'root');
}catch(Exception $e){
    echo $e -> getmessage();
}

version: '3.8'
services:
  web:
    container_name: c-web
    image: php:7.4-apache
    environment:
      - ALLOW_OVERRIDE=true
    ports:
      - "80:80"
    links:
      - db
    working_dir: /application
    volumes:
      - .:/application
      - ./www:/var/www/html/

  phpmyadmin:
    container_name: c-phpmyadmin
    image: phpmyadmin/phpmyadmin:latest
    links:
      - db
    ports:
      - 8081:80
    environment:
      MYSQL_USER: HOUser
      MYSQL_PASSWORD: HOSokol12.
      MYSQL_DATABASE: HO-Sokol

  db:
    container_name: c-mariadb
    image: mariadb
    restart: always
    working_dir: /application
    volumes:
      - .:/application
      - ./mysql:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: toor
      MYSQL_USER: HOUser
      MYSQL_PASSWORD: HOSokol12.
      MYSQL_DATABASE: HO-Sokol
    ports:
      - "3306:3306"

Require all granted

RewriteEngine On

# redirects hello/world to hello/world.html (if hello/world does not exists)
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html