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} echo | Control Panel ; echo | Logout ; } So, that s header.php. It displays the title, login status, and appropriate menu items based on the user level. http.php Next, take a look at http.php, the last of your included files: function redirect($url) { if (!headers_sent()) { header( Location: http:// . $_SERVER[ HTTP_HOST ] . dirname($_SERVER[ PHP_SELF ]) . / . $url); } else { die( Could not redirect; Headers already sent (output). ); } } You may have noticed that this is another function and wondered why we didn t include it in the outputFunctions.php file. We certainly could have, but we made the choice to separate them for two reasons. First, outputFunctions.php is for functions that output data to be displayed on the screen, either directly or indirectly (as with trimBody()). The http.php file is used for browser functions; in this case, we have only one of those redirection. Second, the redirection function and the output functions are used at different times. By grouping functions with similar functionality, we minimize the size of included files. Whew. All this coding, and nothing yet to show on the screen! There are two more files to go that don t output anything. These are the workhorses of the application, so they are a bit longer than the rest. Transaction Pages So now you come to the tasty, gooey center of your application: the transaction pages. Any time data is posted from a form, it s handled by either the transact-user.php or transact-article.php page. Keeping all the data-manipulating code in a centralized place, such as transaction files, makes maintenance down the line easier you d know exactly where to go hunting for bugs. In this case, you use two different files simply to make the code more manageable. Try It Out User Transactions In your first transaction file, you re going to be creating the code that performs all user data manipulation, including login, account maintenance, and access control. 1. Enter this code, and save it as transact-user.php: Looking for affordable and reliable webhost to host and run your business application? Then look no more and go to servlet web hosting services.