<?php

function not_a_closure() {
  return 1;
};
$rf = new ReflectionFunction('not_a_closure');
var_dump($rf->isClosure());
var_dump($rf->isGenerator());


function is_a_generator() {
  yield 1;
  yield 2;
};
$rf = new ReflectionFunction('is_a_generator');
var_dump($rf->isClosure());
var_dump($rf->isGenerator());


$cl = function() {
  return 1;
};
$rf = new ReflectionFunction($cl);
var_dump($rf->isClosure());
var_dump($rf->isGenerator());


$cl = function() {
  yield 1;
  yield 2;
};
$rf = new ReflectionFunction($cl);
var_dump($rf->isClosure());
var_dump($rf->isGenerator());