How to hide program file directory in php desktop software

Question

So, I'm writing a program for a company. But they don't want a web based project and I wrote all the codes in php. So I used php desktop and inno compiler to build a simple desktop software. My problem is when I compile the files in to a setup file and install it on another computer, it shows all the main files in the folder directory leaving my codes prone to editing. I just want to know if there is a way to make the files hidden or something so that the user cannot see it. I've tried asking this question on other platforms but couldn't find an answer. Please I need help.