Online Voting System Project by PHP

Hello All, I am working on PHP project and I want to know the optimized source code of online voting system project. Basically, Though this project is last on this list, it is very popular as everybody hates polling booths and long queues but, most importantly, we despise corruption in any voting system. This project is created with the help of Bootstrap, PHP, Javascript, and CSS. 
Some of the features are: 
Login
Manage Administrators
Manage Candidates
Manage Positions
Check Poll Results
Update Password
Update Profile
Logout

I have taken this reference from here. Can anyone provide me the source code?