ReWrite Php code for exisiting ecommerce site

I have exisiting PHP code / database running on a webhost. I need this code to be altered, improved and changed so that it is not 100% like the original code. The code is fully operation and is running on a website. It is an ecommerce site, with MySQL database It is custom written and not based on any ecommerce platforms It has an admin section where you can view orders/ change products/add products/change categories etc... Requirements: - Take exisiting code, look over and alter in every way you can imagine so that is is not 100% like the original code and so that someone looking at this code cannot determine its the same code. -Improve upon this code perhaps for better speed efficiency Basically looking at the product I already HAVE, i want you to re-create it but so its not 100% the same but operates the same. Must work the same, and have same features and prehaps more as we continue. The look visually of the website should be different too.