#!/usr/local/bin/php
<?php

trait Wat
{
  private $coef = 1;
  public function __construct() { $this->coef = 2; }
  private $cb = [__CLASS__, 'test'];
  private function test($bar) { return $bar * $this->coef; }
  public function __invoke($baz) { 
    return dynamize($this->cb, $this)($baz); 
  }
}


class Foo
{
  use Wat;
}

function dynamize(callable $callable, $scope = null)
{
    $cb = function(...$args) use ($callable) { return call_user_func_array($callable,
 $args); }; 
    $cb->bindTo($scope); 

    return $cb;
}

function callee()
{
  $callStack = debug_backtrace();
  return $cb[1]['object'];
}

echo (new Foo)(7);