Example User Class

<?php

class My_Model_User
{
  protected $_fullName;
  protected $_username;
  protected $_email;
  protected $_created;
  protected $_updated;

  public function setFullName($fullName)
  {
     $this->_fullName = (string) $fullName;
     return $this;
  }
  public function getFullName()
  {
     return $this->_fullName;
  }
  ...
}