Get advantage of XDebug extension to enable debugging of your PHP Web Project.
Hit F5 to start your web, and turn your Visual Studio into ultimate PHP debugging environment.
If there is any configuration issue, you will be notified with an automatic fix option. For more customized debugging and server options, go to your project properties.
By default, IntelliSense features (like autocompletion) work within the current project. If the project uses declarations from a different project, you can reference it.
All the projects you would like to work with has to be loaded in your Solution. Locate References of the project in Solution Explorer. Right click and choose Add reference. Then you'll be able to select referenced projects.