pear auth

ref: http://circle.ch/blog/p566.html

Abstract
PEAR offers now a session based authentication using a database container. The sample below should help you to start up with it.
Script

01  02  /**
03  * Authentication using PEAR Auth and MySQL
04  *
05  * -----------------------------------------------------------------------
06  * # Add this table to a database called 'auth':
07  * # Table structure for table `auth`
08  *
09  * CREATE TABLE auth (
10  * username varchar(50) default NULL,
11  * password varchar(50) default NULL
12  * ) TYPE=MyISAM COMMENT='PEAR, Auth';
13  *
14  * # Data for table `auth`, user:test, pwd:test
15  * INSERT INTO auth VALUES ('test', '098f6bcd4621d373cade4e832627b4f6');
16  * INSERT INTO auth VALUES ('demo', 'fe01ce2a7fbac8fafaed7c982a04e229');
17  *
18  * -----------------------------------------------------------------------
19  * Author: Urs Gehrig
20  * Date: 2002-04-15
21  *
22  * Infos: http://pear.php.net/manual/en/packages.auth.auth.php
23  * $Id$
24  */
25  
26  require_once("PEAR.php");
27  require_once("DB.php");
28  require_once("DB/mysql.php");
29  require_once("Auth/Auth.php");
30  
31  // Initialization of database related information
32  $params = array(
33                "dsn" => "mysql://root:@localhost/auth",
34                "table" => "auth",
35                "usernamecol" => "username",
36                "passwordcol" => "password"
37            );
38  
39  // A database is used as storage container in this example
40  $a = &new Auth("DB", $params );
41  
42  // Detection, if user is logged in. Otherwise the login form
43  // is being displayed.
44  $a->start();
45  
46  if ($a->getAuth())
47  {
48      if($_GET[act] == "logout")
49      {
50          // Log user out
51          $a->logout();
52          echo "You have been logged out!
\n";
53          echo "\"$_SERVER['PHP_SELF']?act=login\">Login\n";
54      }
55      else
56      {
57          // Output the content of your site, that is only visible
58          // for users which have been authenticated successfully.
59          printf("Welcome user %s!
\n", $a->getUsername() );
60          echo "
\"$_SERVER['PHP_SELF']?act=logout\">Logout\n";
61      }
62  }
63  else
64  {
65      // Not authenticated
66      echo "You are not authenticated.
\n"\n";
67      echo "[Try: demo,demo or test,test];
68  }
69  ?>