Chainable wrapper for PHP

Chainable.php

<?php
class Chainable {
	private $obj;
	private $result;
	public function __construct($obj){
		$this->obj = $obj;
	}
	public function __call($method, $args) {
		if (substr($method, 0, 1) == '_') {
			array_unshift($args, $this->result);
			$method = substr($method, 1);
		}
		$this->result = call_user_func_array(array($this->obj, $method), $args);
		return $this;
	}

	public function __set($key, $value){$this->obj->$key = $value; return $this;}
	public function __get($key){return $this->obj->$key;}

	public function result(){
		return $this->result;
	}

	public static function get($obj){
		$chainable = new Chainable($obj);
		return $chainable;
	}
}