gistfile1.php

class daughter extends parent implements teenager {

    public $attitude;
    private $moods = array('happy', 'angry', 'sulky', 'upset', 'silly', 'grumpy');

    public function __construct() {
        $this->attitude = $this->moods[array_rand($moods)];
        $this->wakeup(time());
    }

    private function wakeup($now) {
        if(date('H', $now) < 11) {
            $this->attitude = 'grumpy';
        }
    }
}