Method that gathers debug info about another Method

I have a Method that does some jobs, a bit like this:

public function foo(array $ids)
{
    $foos = $this->getAllFoos($ids);
    $foos = $this->sortAllFoos($foos);
    $filteredFoos = $this->filterOutsomeFoo($foos);
    
    return $filteredFoos;
}

This function is a method used by the system. Now actual people want step by step insights on how we end up with the $filteredFoo in order to double check wether it's done right. I'm looking for a method to do this gracefully.

• I can make a copy of this method and store everything in seperate values, but that'll become a maintance as I now need to make all changes twice, I dont like WET. I want DRY.
• I can pass an extra param like foo(array $ids, &$debug = []) and add a $debug['ids']=$ids, $debug['foos']=$foos, $debug['sortedFoos']=$sortedFoos, but as my actual method is a bit larger, that nearly doubles the lines in my method.

Does anyone know a more elegant solution (I'm currently using option 2) which can be used?