To use Xdebug with a PHP application running in a Docker container, you will need to do the following:
Install the Xdebug extension on the PHP container. This can typically be done by installing the php-xdebug package using a package manager like apt-get or yum.
Configure the Xdebug extension in your PHP configuration file (usually php.ini). You will need to set the following options:
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xdebug.remote_enable=1
xdebug.remote_host=host.docker.internal
xdebug.remote_port=9000
xdebug.remote_autostart=1
If you are using a PHP development environment on your host machine (e.g. PHPStorm), you will need to configure it to listen for incoming Xdebug connections.
Consult the documentation for your development environment for specific instructions on how to do this.
Finally, you will need to configure your Docker container to forward traffic on the Xdebug port (9000) to the host machine. This can be done using the -p flag when starting the container:
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docker run -p 9000:9000 my-php-app
With these steps in place, you should be able to use Xdebug to debug your PHP application running in the Docker container.