Klass Implementation for PHP 5.4+

klass.php

<?php

class Klass {
  private $props = array();
  public function __construct(array $params = array()) {
    $this->props = $params;
  }
  public function __call($method, $arguments) {
    if ($item = $this->$method) {
      if ($item instanceof Closure) {
        return call_user_func_array($item->bindTo($this), $arguments);
      }
    }
    throw new Exception("Undefined method: $method");
  }
  public function __set($key, $val) {
    $this->props[$key] = $val;
  }
  public function __get($key) {
    if ( ! empty($this->props[$key])) {
      return $this->props[$key];
    }
    throw new Exception("Undefined property: $key");
  }
}


$foo = new Klass([
  'x' => 'y',
  'z' => function () {
    echo $this->x;
  },
]);

$foo->z();

$foo->z = function () {
  return phpversion();
};

echo "\n", $foo->z();

#$foo->bar();
#echo $foo->candy;
#var_dump($foo);