Implementing MVC in PHP: The Model
FR_User
FR_User is a basic data object in the users table. I created a single table called fr_users in a MySQL database called framework:
CREATE TABLE `fr_users` (
`userID` int(11) unsigned NOT NULL auto_increment,
`email` char(45) NOT NULL default '',
`password` char(15) NOT NULL default '',
`fname` char(30) NOT NULL default '',
`lname` char(30) NOT NULL default '',
`posted` datetime NOT NULL default '0000-00-00 00:00:00',
`status` enum('active','disabled') default 'active',
PRIMARY KEY (`userID`),
UNIQUE KEY `email` (`email`),
KEY `posted` (`posted`),
KEY `status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
-- Special user for anonymous/not-logged-in users
INSERT INTO `fr_users` VALUES (0,'anon@example.com','','Anonymous','Coward', \
'2005-06-05 11:33:56','disabled');
<?php
/**
* FR_User
*
* @author Joe Stump <joe@joestump.net>
* @copyright Joe Stump <joe@joestump.net>
* @license http://www.opensource.org/licenses/gpl-license.php
* @package Framework
* @filesource
*/
/**
* FR_User
*
* Base user object.
*
* @author Joe Stump <joe@joestump.net>
* @package Framework
*/
class FR_User extends FR_Object_DB
{
public $userID;
public $email;
public $password;
public $fname;
public $lname;
public $posted;
public function __construct($userID=null)
{
parent::__construct();
if ($userID === null) {
$session = FR_Session::singleton();
if (!is_numeric($session->userID)) {
$userID = 0;
} else {
$userID = $session->userID;
}
}
$sql = "SELECT *
FROM fr_users
WHERE userID=".$userID." AND
status='active'";
$result = $this->db->getRow($sql);
if (!PEAR::isError($result) && is_array($result)) {
$this->setFrom($result);
}
}
public function __destruct()
{
parent::__destruct();
}
}
?>
Notice that the constructor looks around for user IDs in various forms. If it receives a user ID, the class fetches the given user ID. If it does not receive a user ID, it checks the session; if a user ID is not present, it assumes the user is not logged in and it loads the special anonymous user record.
The special anonymous user allows me to have a special user for people not logged in. It allows me to easily and quickly check whether a user is logged in:
...
if ($this->user->userID > 0) {
// User is logged in
}
...
I would have much rather made FR_User a singleton; however, PHP5 does not allow a child class to have a private constructor when the parent class, FR_Object_DB, has a public constructor.
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