How to Set PHP Options for Wordpress in Docker Compose

Create a new file named wordpress.ini and and enter the following entries in it:

file_uploads = On
memory_limit = 256M
upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 300
max_input_time = 1000

In the Wordpress docker-compose.yml file, mount the file as a volume as follows:

version: '2'
services:
   wordpress:
     depends_on:
       - db
     image: wordpress:5.5.0-php7.2-apache
     ports:
       - "8080:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_PASSWORD: P@ssw0rd2
     volumes: 
       - ./wordpress.ini:/usr/local/etc/php/conf.d/wordpress.ini 
volumes:
    db_data:

Restart the wordpress container:

docker-compose down && docker-compose up -d