Xdebug PHP FPM

docker-compose.yml

web:
    image: nginx:latest
    ports:
        - "9991:80"
    volumes:
        - ./site.conf:/etc/nginx/conf.d/default.conf
    links:
        - php
php:
    build: php
    volumes:
        - ./:/code
    environment:
        - XDEBUG_CONFIG=remote_enable=1 remote_connect_back=1

php-Dockerfile

FROM php:7.4-fpm
RUN pecl install xdebug-2.9.6 \
   && docker-php-ext-enable xdebug

site.conf

server {
    index index.php index.html;
    server_name _;
    error_log  /var/log/nginx/error.log;
    access_log /var/log/nginx/access.log;
    root /code;

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass php:9000;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param REMOTE_ADDR $remote_addr;
        fastcgi_param PATH_INFO $fastcgi_path_info;
    }
}