<?php

class User
{
    var $username;
    var $password;
    var $full_name;
    var $email;

    public function save()
    {
        $prepared_statement = DB::getInstance()->prepare('INSERT INTO users (username, password, full_name, email) VALUES (?, ?, ?, ?)');
        $prepared_statement->execute(array($this->username, $this->password, $this->full_name, $this->email));
    }
}

// create betty
$betty = new User;
$betty->username = 'betty';
$betty->password = '123';
$betty->fullname = 'Sir Developsalot';
$betty->email    = 'test@test.com';
$betty->save();

// create bob
$bob = new User;
$bob->username = 'bob';
$bob->password = '123';
$bob->fullname = 'Sir Developsalot';
$bob->email    = 'test@test.com';
$bob->save();