function register2(){
            $objReg = new registration($_POST['username'],$_POST['password'],$_POST['email']);
            $objReg->register();
            unset($objReg);
}

class clean
{
    public function process($data)
    {
        $data = trim($data);
        $data = stripslashes($data);
        $data = htmlspecialchars($data);
        return $data;
    }
}

class registration
    {
        // Registration stuffs
        private $regUser = NULL;
        private $regPass = NULL;
        private $regEmail = NULL;

        public function __construct($regName, $regPass, $regEmail)
                {
                    //Set the class properties if they aren't NULL.
                    if (!empty($regName) AND !empty($regPass) AND !empty($regEmail)){
                        $objClean = new clean;
                        $this->regUser  = $objClean->process($regName);
                        $this->regPass  = $objClean->process($regPass);
                        $this->regEmail = $objClean->process($regEmail);
                        unset($objClean);
                    }
                }
    }