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I use Docker for development and for my website too. Now it's time to throw away var_dump and to use Xdebug for PHP Docker container. It's quite easy, because I have created a several Docker PHP Xdebug Images on GitHub. You have only to set your path mappings in your IDE. This image can also be used to generate the code coverage with PHPUnit. Ok, let's go step by step.
Pull the PHP Xdebug image from Docker Hub
Xdebug's step debugger allows you to interactively walk through your code to debug control flow and examine data structures. Xdebug interacts with IDEs to provide step debugging functionality, and therefore you also need to configure an IDE that knows how to talk to Xdebug with the open DBGp protocol. Using Xdebug with Postman Xdebug is using cookies to keep track of a debug session when started through a browser. However, Postman is an API client and doesn’t necessarily use cookies. Requirements: You already need to configure PhpStorm with xdebug and php Here How to Do that: then when requesting from POSTMAN just add XDEBUGSESSIONSTART=PHPSTORM to the query string and PHPStorm will catch the debug session.
Xdebug plugin also exists for other browsers. Finally, in your browser click on the bug in your address bar to switch to the 'Debug' mode. Use Xdebug to debug your APIs route with Postman. Once your Xdebug configuration is added, you need to add?XDEBUGSESSIONSTART=XDEBUGKEYNAME at the end of your route. This was driving me crazy. I just updated to PHP 7.1 and xdebug that was working no longer worked. I updated the xdebug.so file (Linux) and php -version indicated that xdebug was indeed being loaded and working. But when I would use Postman the debugger never kicked on.
Ensure Docker is installed and then run the following command:
This can take some minutes. In the meantime, you can configure your IDE path mappings.
Configure path mappings in PhpStorm
Important is the server name application. PhpStorm uses the serverName to determine the right server. xDebug is automatically enabled in the configuration. If you run this Docker container and listen to incoming connections, it stops on the activated breakpoints. Open the settings File -> Settings -> Languages & Frameworks -> PHP -> Server and enable path mappings. Fill out the name with application and set /app to the absolute path mapping on the server of the root folder. Your project files will be mounted there.
Start the PHP Xdebug Docker container
You have configured your path mappings and enabled listen for incomming Xdebug connections, then you can start the container with the following command from the root of your project.
It's important that your path mapping has the name application and to pass the environment variable PHP_IDE_CONFIG with the name of the server. It is recommended to create a simple bash file which works with every project. Create a file docker-xdebug.sh in your ~/bin folder and put the following lines to it.
Make this file executable with chmmod +x ~/bin/docker-xdebug.sh and you can start a new Xdebug session with:
Breakpoints doesn't work?
Don't expose the Xdebug port 9000
At default, Xdebug's remote host is configured with xdebug.remote_host=172.17.0.1, but it can be different to your Docker gateway IP address. To check your Docker gateway IP run the command $ ifconfig and look for the docker0 network adapter. Since Docker 1.9, the Docker gateway IP for me is 172.17.0.1. You can override the default Xdebug configuration with the php -d xdebug.remote_host=172.17.0.1 parameter. If you are using Docker Machine and VirtualBox, use the IP of the VirtualBox network interface. Here is an example how to override the default Xdebug remote_host option.
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Other PHP Versions
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The prooph Docker PHP build on Docker Hub includes several PHP versions from PHP 5.6 to 7.2 for CLI and PHP-FPM as well.
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Conclusion
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Docker is a perfect match for PHP development. Note that these Xdebug settings also work with a web server like nginx and php-fpm. Interested in profiling? Read more about profiling.
Vagrant users can read Vagrant remote PHP & CLI debugging with PHPStorm.