I have a large scale project which I developed in php mysql. works great. no problem with the code.
However the company I produced this code for us asking for something which I am not aware of.
They need to distribute the code in parts so each new php developer can have access to only limited piece of code and cannot access the other code areas of the whole project.
FYI, I produced this web application using wordpress in the first place, then moved the system in a new dashboard using bootstrap. However the actual code in the background is still using WordPress' classes and database.
Most version management tools will allow you to parse out the separate sections that each developer will require. You'll have to set up each branch with the directories and/or files allowed to each and then set each up with permissions to access only their areas. Then some lucky gent gets to merge all the branches back up to the master branch.
The crazy part about this is that if the code is inter-dependent your developers are going to have a real fun time relying on each other and the master-committer to keep things in synch.