RodrigoDornelles

const TRUE = (p) => (q) => (p)
const FALSE = (p) => (q) => (q)
const OR = (p) => (q) => p(p)(q)
const NOT = (p) => (p)(FALSE)(TRUE)
const AND = (p) => (q) => (p)(q)(FALSE)
const PROG = (func) => FALSE(func())(PROG)
const PRINT = (text) => () => TRUE(console.log(text))
const IF = (cond) => (execute) => (nonexecute) => (cond(execute)(nonexecute))()

PROG

RodrigoDornelles

<?php

$class = call_user_func(function () {    
    $objects = [];

    return function() use (&$objects) {
    	return (object) [
	        'instanceof' => function($object) use (&$objects) {
	            return in_array($object, $objects);
	        },