This VM is created for 2 reasons: 1. Very little initial setup work required to Develop / Test / Deploy a Dynamic Web Application live. 2. This system should keep running for Years, without requiring Updates / Breakages.
If you are new to Virtual Machines, then please watch the Video below ( taken from my other PHP project called teamdocs. Just replace td with lapp wherever mentioned )
Upload your PHP Files using the free FileZilla ftp client software, to this server called lapp.local and also connect to its postgresql db, using the free pgadmin gui client, from any PC on your LAN.
After the application / database is ready, you can access it using https://lapp.local from any LAN PC.
Backup the system regularly to avoid any issues.
These are covered in the video. Google Search helps in finding more about PHP development / troubleshooting.
Apart from Dynamic Applications, you can use this Virtual Machine, to host static webpages too, for the LAN environment.