Resolve a filename from another file

Question

I can currently to the following:

class SubClass extends SuperClass {
  function __construct() {
    parent::__construct();
  }
}

class SuperClass {
  function __construct() {
    // this echoes "I'm SubClass and I'm extending SuperClass"
    echo 'I\'m '.get_class($this).' and I\'m extending '.__CLASS__;
  }
}

I would like to do something similar with the filenames (__FILE__, but dynamically evaluated); I would like to know what file the subclass resides in, from the superclass. Is it possible in any elegant way?

I know you could do something with get_included_files(), but that's not very efficient, especially if I have numerous instances.

Answer 1

Uh, not really, that I can think of. Each subclass would need to have an explicitly implemented method that returned __FILE__, which completely defeats the point of inheritance in the first place.

I'm also really curious as to why something like this would be useful.

Answer 2

You can use Reflection.

$ref = new ReflectionObject($this);
$ref->getFileName(); // return the file where the object's class was declared