Profiling PHP running in apache

Question

I want to know what functions are being called and what time each request is taking for an application which is running on apache.

Is there any tool or any other way where i can get this data.
I also want to know how much time each function is taking.

The application is running it cannot be stopped.
So i need to get the details in the running environment itself.
Thanks in advance.

Answer 1

One of the most used industry tools for this is: http://www.xdebug.org/

I have used it religiously for a long time now! From it's front-page it does the following:

"The Xdebug extension helps you debugging your script by providing a lot of valuable debug information. The debug information that Xdebug can provide includes the following:

* stack traces and function traces in error messages with:
      o full parameter display for user defined functions
      o function name, file name and line indications
      o support for member functions
* memory allocation
* protection for infinite recursions"

Answer 2

Xdebug can write a profiling file that you can analyze in kcachegrind or wincachegrind.