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<form method="post" action="/simple_blog/inc/update.inc.php" enctype="multipart/form-data"> <fieldset> <legend>< php echo $legend ></legend> <label>Title <input type="text" name="title" maxlength="150" value="< php echo $title >" /> </label> <label>Image <input type="file" name="image" /> </label> <label>Entry <textarea name="entry" cols="45" rows="10">< php echo $entry ></textarea> </label> <input type="hidden" name="id" value="< php echo $id >" /> <input type="hidden" name="page" value="< php echo $page >" /> <input type="submit" name="submit" value="Save Entry" /> <input type="submit" name="submit" value="Cancel" /> </fieldset> </form> < php endif; > </body> </html> < php endif; // Ends the section available to logged in users > At this point, you ve barred anyone who isn t logged in from seeing administrative links and performing administrative tasks such as creating, editing, and deleting entries.

//Let's assume you already have a valid set of cookies in place. setcookie ("cookie_user", "test", time()+60*60*24*30); setcookie ("cookie_pass", md5 ("test"), time()+60*60*24*30); //Here is an example to set a cookie based on a correct login. function validatelogin (){ //Check for a valid match. if (strcmp ($_COOKIE['cookie_user'], $GLOBALS['username']) == 0 && strcmp ($_COOKIE['cookie_pass'], md5 ($GLOBALS['password'])) == 0){ return true; } else { return false; } } //You call the validatelogin() script. if (validatelogin ()){ echo "Successfully logged in."; } else { echo "Sorry, invalid login."; } >

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There is no law that says you have to develop with classes and objects only. Well-designed object-oriented code provides a clean interface that can be accessed from any client code, whether procedural or object oriented. Even if you have no interest in writing objects (unlikely if you are still reading this book), you will probably find yourself using them, if only as a client of PEAR packages.

As you can see, using a set of cookies is rather simple; you can simply access them via the $_COOKIE superglobal. In this case, you compare the (currently) global username and password against the cookies that have been set. If a match is acquired, the unique user is logged in, and the script will remember him until the cookie is expired or until the user physically removes the cookies from their collection. Note also the ease of use with encrypted cookies. If you know how and if a cookie has been encrypted, it is a simple matter of comparing the cookie against an md5()-enabled variable.

Objects mind their own business and get on with their allotted tasks behind closed doors. They provide an interface through which requests and results can be passed. Any data that need not be exposed, and the dirty details of implementation, are hidden behind this front. This gives object-oriented and procedural projects different shapes. The controller in an object-oriented project is often surprisingly sparse, consisting of a handful of instantiations that acquire objects and invocations that call up data from one set and pass it on to another. A procedural project, on the other hand, tends to be much more interventionist. The controlling logic descends into implementation to a greater extent, referring to variables, measuring return values, and taking turns along different pathways of operation according to circumstance.

Removing cookies is also a simple task. You should note that cookies will disappear by themselves if you have set them up to do so. Cookies that have not been assigned a time to die will simply be removed when the browser window closes. Sometimes, however, a user will want to be able to clear the cookies on a site. Such functionality typically goes by the name of logout and is a staple of a well-programmed user interface. The following code allows a user to log out.

Now that you require authorization for a user to view administrative links, you need to build in the functionality that allows your administrators to log in and gain access to those links. To do this, you first need to create a login form where a user can enter her credentials to request access to the administrative links. A logical location to place your login form is at http://localhost/simple_blog/admin. For the moment, admin.php shows a blank page if the user hasn t logged in because authorization is required before the page will do anything at all. You can fix that by placing the login form at the bottom of admin.php, inside an else block. Doing so shows a login screen to anyone who isn t logged in already. Your login form requests a username and password and uses the POST method to send this information to update.inc.php, along with a hidden input named action that passes the value, login.

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