This is a revision of George Mihailhoff's PHP Anonymous Object Class. I stumbled upon this class as I was looking for a way to attach functions to properties in a stdClass. This is not directly possible as there is no __call function inbuilt. And I found this code on a stackoverflow post that George had answered. However the implementation didn'…

AnObj-v2.php

<?php

class AnObj
{
  protected $methods = array();
	protected $properties = array();
 
	public function __construct(array $options)
	{
		
		foreach($options as $key => $opt) {
			//integer, string, float, boolean, array
			if(is_array($opt) || is_scalar($opt)) {
				$this->properties[$key] = $opt;
				unset($options[$key]);
			}
		}

		$this->methods = $options;
		 foreach($this->properties as $k => $value)
      		$this->{$k} = $value;
	}
 
	public function __call($name, $arguments)
	{
		$callable = null;
		if (array_key_exists($name, $this->methods))
			$callable = $this->methods[$name];
		elseif(isset($this->$name))
			$callable = $this->$name;
 
		if (!is_callable($callable))
			throw new BadMethodCallException("Method {$name} does not exists");
 
		return call_user_func_array($callable, $arguments);
	}
}

$person = new AnObj(array(
	"name" => "nick",
	"age" => 23,
	"friends" => ["frank", "sally", "aaron"],
    	"sayHi" => function() {return "Hello there";}
));

echo $person->name . ' - ';
echo $person->age . ' - ';
print_r($person->friends) . ' - ';
echo $person->sayHi();


?>

Note that the properties member array is unnecessary, you can just directly do $this->$key = $opt; in the first foreach loop.

In fact, perhaps the methods member array is unneeded also, you could add those to the class via the same code and then in the call method just always look for isset($this->$name).

BTW, if you want to make a method that needs to use the "$this" pointer you can, but you have to add that method to the class after the initial construction. So, in your example, after $person is declared you could declare:
$person->getFriend = function($id) use($person) { return $person->friends[$id]; };

No you don't. You just need to bind $this to the function. I modified this gist to do this here.