This blog post has been sitting on my desk for quite a while but due to a lot of work in the last weeks I was not able to finish it earlier. Luckily, I found some time during my travels to finish the blog post and share my findings on the "require-dev gone wrong!" problem. While some people thought the former blog post was mostly click bait or proposed a "fix" which does not actually solve the general problem, I actually got a lot of good feedback on twitter. Even an issue for Composer was created to discuss the problem even though it was closed by now.
For a long time, I have been advocating to make use of require-dev to install development tools locally. We use this on a daily basis to install tools like Phing, PHPUnit or phpDocumentor locally for each of our (customer) projects. Given that our focus is on custom projects, this absolutely makes sense. I do not want our projects to use an old version of a given tool or update all our projects constantly to use the latest version of all the tools involved. In addition to that, a simple composer.phar install in the project root should be sufficient to install all dependencies required to build and run the project.