Track each function call dynamically

I was wondering, can you make a function or something, that looks for other function calls across the site? I think, that if there is a master page, you could include it at the very top and it should work sitewise.

But I have no idea how to do this.

Kind of like debug_backtrace();, but global. In other words, a function that does something with a function that has been called after this function.

Well, I see that you could do this with a开发者_StackOverflow中文版 specific call_user_func();, therefore track everything what's going on, but.. any dynamic way?

Thanks in advance!

Goal

The goal of this is to dynamically keep chain of called functions. So at some moment, for example, I require a value back from 3rd function in chain, so I can simply retrieve it with something like $calls[2]; // the stored returned value or an array containing info about function + returned value.

And it adds function data to chain on each call, where 1st call's $key = 0. So for debugging purposes, when my function fails which is x function in a row, I'd love to know information about previously called functions, maybe one has returned wrong value, resulting in error at some part later on.

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It looks like you are looking for some AOP technique. You could write the weaved code to return immediately if some (global) flag (show trace) is not set, otherwise print the backtrace.

PHP doesn't support AOP directly but you can either patch the PHP core or use tools to create (transform the) code based on the AOP weavings. I haven't used it for PHP yet, so you have to google.

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I don't believe there is, and I doubt if it would work and would be useful. Functions in turn call other functions, even the internal ones. Even the logging functions are functions themselves, so you end up with an enormous amount of information with which you can do virtually nothing relevant. If such a solution exists (it may), it won't be developed in PHP itself, but be a module that is loaded by or compiled in PHP.

If you want to log method calls to class instances, you could make some hook. You can make a class that implements __call. Then, for an instance you want to log, assign that instance to an instance of your log class, and assign that log class instance to the variable in which the original class was stored.

Then, each method call is directed to your class and you can log each call before you call the original method.

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Give a try to diyism_trace.php:

http://code.google.com/p/diyism-trace/