abusing magic methods to create an object just JS-esque enough to make you nostalgic, if you squint

dynamic_object.php

<?php
/**
 * Objects of this class are superficially similar to JavaScript objects 
 * in that you can dynamically add and overwrite both properties and methods
 * the resemblance is not very strong, though.
 */
// Note, there are a few ways to pass functions around
// in arrays is one
// $F = array();
// 
// $F['hello'] = function ($say = 'world!') {
//   print('Hello, ' . $say . '<br>');
// };
// which you can cast to object, but the hello property isn't a method
// 
// $G = (object) $F;
// 
// echo method_exists($G, 'hello') ? 'true' : 'false';
// echo '<pre>' . print_r(get_object_vars($G), 1) . '</pre>';
// 
// but is still callable if you're willing to get ugly:
// call_user_func($G->hello);
// Alternatively, you can abuse the magic methods __set, __get, and __call

class DynamicObject {

    protected $methods = array();
    protected $properties = array();

    public function __set($name, $value) {
        // overwrite existing properties and methods without warning, js would
        return is_callable($value) ? $this->methods[$name] = $value : $this->properties[$name] = $value;
    }

    public function __get($prop) {
        return $this->properties[$prop] ? : false;
    }

    public function __call($name, $args) {
        return $this->methods[$name](implode(',', $args));
    }

}

// pretend we want a utility object to pass around
$utils = new DynamicObject();
$utils->hello = function ($hello = 'world!') {
            print('Hello, ' . $hello . '<br>');
        };
$utils->prefix = 'Mr.';
$utils->hello($utils->prefix . ' sailor!'); // Hello, Mr. sailor!
echo $utils->prefix; // Mr.