I customized mine like the following, including the default mode set to off (which my environment variable above overrides to develop,debug
Using the docker-php-extension-installer with the official PHP image, a blank configuration file lives in /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini. In my setup, I chose to enable XDebug via an environment variable in my docker-compose.yml file: This could be helpful for dev/prod setups. You can control XDebug configuration via environment variables. Note that the port must match what XDebug is configured to connect to, and the pathMappings may be different for your application Create a VSCode debug configuration for XDebug like this:. Create a info.php that includes the line xdebug_info() which you can access in the host's web browser to verify what Xdebug settings are enabled. 
In your image, copy in your application code. In your image, install XDebug v3 using the Docker PHP extension installer. Build a Docker image from the official PHP image. Install VSCode and the PHP Debug extension by Felix Becker. Some earlier versions of Docker have OS-specific ways of enabling this. Docker v20.10+ includes a special hostname that containers can access when enabled. Thus, it's not necessary to expose any ports to the container, rather, the container needs to know how to connect to the host. This connection is established from inside the Docker container out to the host. The way XDebug is designed (as I understand it), XDebug inside of the Docker container is more like a "client" that connects to a debug "xdb server" running in VSCode. Normally, processes inside a Docker container shouldn't need to connect to services on the host. Basically, forget what you know about xDebug 2 configuration files and go read the docs. Once I realized I was running XDebug v3, it became easier to get this working. Most of the internet resources I found on the internet pertain to XDebug v2. The config file and behavior of v3 is very different from v2. 
XDebug v3 has breaking changes from v2.What I discovered trying to make this work I use the Docker PHP extension installer to install my extensions, XDebug and Composer. My PHP application code runs inside the official Docker PHP container, php:7.3-apache. I want to debug my running dockerized PHP web application code from within VSCode using XDebug. VSCode with PHP Debug Extension (Felix Becker).Debugging PHP with XDebug v3 inside Docker using VSCode Assumptions / Prerequisites
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