Change website

Maintaining a website, and a bit of code to change according to demand.
Brothers because the site is written, it can not curse.
Open your browser and start from the login page to see get method parameters.
The get method to find the corresponding parameters in the source code.
Each perform an operation code is executed to find where in the source code.
For PHP / JS I was very unfamiliar. After cooked, it is manual labor.