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Implementing MVC in PHP: The Model
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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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