Symphony Debugging Log for trace executing functions step by step

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I have a project which have developed in PHP Symphony framework. There are more than one thousand files and more critical for MVC. And I am a new comer in Symphony framework. So, when I need to change in my project than I am not finding files for changing as my new required update. So, I think I need a debugger tools for tracing which files and method are executing when I am running my project in localhost/nkhrm.

Have you any idea to learn my project's complex code step by step ?