For a good and maintainable application, high-quality product code is essential. The code quality usually depends on the developer’s professionalism. But among the thousands of lines of code, something might be missed. Fortunately, there are several small yet useful utilities that can automate some routines and help you check the code using different rules for different coding standards. In PHP development, there are two popular utilities for code validation: Code Sniffer and Mess Detector.