The Semaphore site (a testing and deployment service) has posted a tutorial showing how to set up a continuous integration/deployment using their service, GitHub and Heroku for a PHP application.
The practice of continuous delivery is steadily gaining ground in the PHP community. [...] With PHP support being recently launched on both Semaphore and Heroku, you can set up a continuous delivery pipeline for your web application in a matter of minutes. In this post I will show you how to set up continuous integration and deployment for a simple Laravel web application through Semaphore. You can find the application’s source code on GitHub.
They walk you through the creation of the Heroku application, grabbing the API key and connecting the Semaphore account with GitHub. Once linked, you can select the repository and any build commands needed for deployment. Finally, they show how to configure the actual continuous version of the deployment and have it release after each successful build.