Using Xdebug with docker and PhpStorm

Oct 20, 2018 20:33 · 466 words · 3 minute read php xdebug docker laravel

Over the last two weeks i have been working on a tricky bug, related to timezones and recurring bookings. After a while you get sick of making changes to your code, adding some dd()’s in there and re-running your request. Don’t get me wrong, dd() is useful, sometimes quicker to use too. But if you’re in a loop somewhere and want to find out what’s happening, it’s not really much help at all.

We’re using docker (+ compose) to develop locally, and from what i’ve read it’s a bit of a nightmare to set things up. I asked for some help to get this set up and Leo pointed me to a tutorial he wrote back in January. Parts of it worked for my set-up, but not all of it.


So to begin with, you need to make sure that nginx is set up properly. nginx needs to be able to respond with the correct SERVER_NAME.

If you don’t have this set up already, add it in to your nginx.conf. For this tutorial i will be using api.mypthub.test, which is what we use, replace any instance of this in the tutorial with the domain you use.

Add it into your main server block and also into the PHP block.

server {
  server_name api.mypthub.test
  location ~ \.php$ {
    fastcgi_param SERVER_NAME api.mypthub.test;


Next up is changing our php-fpm container.

We need to make sure that Xdebug is installed, and that it gets set up correctly. Update your containers dockerfile to include the following:

RUN pecl install xdebug-2.5.5 \
&& docker-php-ext-enable xdebug \
&& echo "xdebug.remote_enable=on\nxdebug.remote_autostart=1\nxdebug.remote_host=host.docker.internal\nxdebug.remote_port=9001\nxdebug.idekey=PHPSTORM" > /usr/local/etc/php/conf.d/xdebug.ini

After this has run, on our container the xdebug.ini will look like this:


We set the host to host.docker.internal here as it works for providing the host machines IP on every platform (thanks to Patrick for the tip!).


Last but not least, we have to set up PhpStorm so that it connects to Xdebug.

  1. Open up preferences cmd+,
  2. Navigate to: Languages & Frameworks > PHP > Debug > DBGp Proxy
  3. Fill out the details
  5. Host:
  6. Port: 9001
  7. Navigate to Languages & Frameworks > PHP > Debug
  8. Set Xdebug port to 9001
  9. Navigate to Languages & Frameworks > PHP > Servers
  10. Add a server named api.mypthub.test then add a path mapping to your project folder. Mine is /application/api, because my docker-compose.yml mounts a volume like this: .:/application:cached. Change this based on how your data is mounted in your container.


Simply click on the Run menu in PhpStorm, then Start listening for PHP debug connections. Set some breakpoints in your code and send a request.

Use the debug panel to work things out instead of using dd() everywhere.

Good luck fixing those bugs ;)

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