Question

How can I get the number of times a function has been nested in PHP?

Eg.

function infinite(){
  infinite();
}

Answer 1

You can recurse like this:

function infinite($depth = 1) {
  infinite($depth + 1);
}

infinite();

Then $depth contains the current level of recursion inside the function.

You could also fiddle with debug_backtrace, but this is not very efficient, so you should for example not execute that in every step of the recursion!