`  == PHP LOGIN SCRIPT WITH MYSQL WITHOUT CREATING SESSIONS ==  Create a file for Login and Logout (PHP + MySQL) using with a SESSION variable. This file contains Login form, Login authorize program and Logout program. All in one but Short and Easily.  This tutorial require 2 PHP files and 1 table of mySQL database.     1. index.php this file is the Login and Logout file.    2. main.php this file is the target when login is O.K.    3. Database ``tutorial`` and table ``admin`` with 3 fields: id(auto_increment), username(varchar, 50), password(varchar, 32).       * The ``password`` field is design for md5() password for more sucurity.        What is md5() function? Click here.        Then put a record into this table. In this tutorial, put a record with name ``admin`` and password ``81dc9bdb52d04dc20036dbd8313ed055``. This password was encrypted by md5() function from the real password ``1234``.        * When you test this script you must to put the real password (1234) in ``password`` box.    • index.php  The mainly file for do 3 things.      * Login form. Including 2 fields ``username`` and ``password`` and submit button ``Login``.     * Login authorize program. Do authorize check after you submit form, if passed in username and password, this page will re-direct to main.php. If not, show the invalid user or password message.     * Logout. Clear the login session when come back or refresh this page.   Source Code       Untitled Document     ``>   User      Password               main.php  This file is the target file when authorize check on index.php has been passed. It checks for session variable name ``username``. If this variable does not exist, re-direct to index.php.  If you have PHP files must Login before open them, copy the PHP section and place it on the top of them. Source Code       Untitled Document    Hello ! You are now Logged in. Logout   http://www.phpsimple.net/tutorials/login_logout/`