// basic class
class Demo {
    public static $prototype;
}

// prototype assignment, with optional methods
Demo::$prototype = new prototype(
    'Demo',
    array(
        'set_name' => array('$name', '$this->name = $name;'),
        'get_name' => array('return $this->name;')
    )
);

// a generic instance
$demo = new Demo();
$demo->set_name('Andrea Giammarchi');
echo $demo->get_name(); // Andrea Giammarchi

// add more prototypes
Demo::$prototype->set_age = array('$age', '$this->age = $age;');
Demo::$prototype->get_info = array('return $this->name." is ".$this->age." years old";');

$demo->set_age(30);
echo '
', $demo->get_info();
// Andrea Giammarchi is 30 years old

?>