Read only property

gistfile1.php

    public function __get($name) 
    {
        if (method_exists($this, "get_$name")) {
            return $this->{"get_$name"}();
        } else if (method_exists($this, "set_$name")) {
            throw new Exception("Writeonly property $name");
        } else {
            throw new Exception("Undefined property $name");
        }
    }

    public function get_woot()
    {
        return 'woot !';
    }