How do I configure phpMyAdmin2 to use the correct internal MySQL port in Docker Compose?

I have a docker-compose setup with 2 MySQL containers and 2 phpMyAdmin instances. The first setup works fine, but phpMyAdmin2 (accessed via localhost:8081) fails to connect to the mysql_logs container, displaying the error:

Cannot connect: invalid settings.
mysqli::real_connect(): (HY000/2002): Connection refused

My docker-compose.yml currently looks like this:

YAMLCopied
services:
  mysql_logs:
    image: mysql:5.6
    restart: on-failure
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: logs
    ports:
      - '3307:3306'

  mysql:
    image: mysql:5.6
    restart: on-failure
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: app
    ports:
      - '3306:3306'

  nginx:
    image: nginx:1.19.0-alpine
    restart: on-failure
    volumes:
      - './public/:/usr/src/app'
      - './docker/nginx/default.conf:/etc/nginx/conf.d/default.conf:ro'
    ports:
      - '80:80'
    depends_on:
      - php

  php:
    build:
      context: .
      dockerfile: docker/php/Dockerfile
    volumes:
      - './:/usr/src/app'
    depends_on:
      - mysql

  phpmyadmin:
    image: phpmyadmin
    restart: always
    ports:
      - 8080:80
    environment:
      - PMA_HOST=mysql
      - PMA_PORT=3306
      - PMA_USER=root
      - PMA_PASSWORD=root

  phpmyadmin2:
    image: phpmyadmin
    restart: always
    ports:
      - 8081:80
    environment:
      - PMA_HOST=mysql_logs
      - PMA_PORT=3307
      - PMA_USER=root
      - PMA_PASSWORD=root

The accepted answers indicate that containers communicate via their internal ports (3306), and the port mapping (3307:3306) only applies for external connections. I now need to update phpmyadmin2 to connect using the internal port. How should I adjust my configuration to resolve the connection issue?