627 Script Architecture Remember that you can execute this SQL by typing mysql -u root -p < create_database.sql You will need to supply your root password. (You could, of course, execute this script via any MySQL user with the appropriate privileges; we have just used root here for sim- plicity.) You should change the password for the mlm user and the administrator in your script before running it. Some of the fields in this database require a little further explanation, so let’s briefly run through them. The lists table contains a listid and listname. It also contains a blurb,which is a description of what the list is about. The subscribers table contains email addresses (email) and names (realname)of the subscribers. It also stores their password and a flag (admin) to indicate whether or not this user is an administrator.We will also store the type of mail they prefer to receive in mimetype.This can be either H for HTML or T for text. The sublists table contains email addresses (email) from the subscribers table and listids from the lists table. The mail table contains information about each email message that is sent through the system. It stores a unique id (mailid), the address the mail is sent from (email), the subject line of the email ( subject), and the listid of the list it has been sent to or will be sent to.The actual text or HTML of the message could be a large file, so we will store the archive of the actual messages outside the database.We will also track some general status information: whether the message has been sent (status), when it was sent (sent), and a timestamp to show when this record was last modified (modified). Finally, we use the images table to track any images associated with HTML messages. Again, these images can be large, so we will store them outside the database for efficien- cy. Instead, we will track the mailid they are associated with, the path to the location where the image is actually stored, and the MIME type of the image (mimetype), for example, image/gif. The SQL shown previously also sets up a user for PHP to connect as, and an admin- istrative user for the system. Script Architecture As in the last project, we have used an event-driven approach to this project.The back- bone of the application is in the file index.php.This script has four main segments, which are 1. Preprocessing: Do any processing that must be done before headers can be sent. 2. Set up and send headers: Create and send the start of the HTML page. 3. Perform action: Respond to the event that has been passed in.As in our last example, the event is contained in the $action variable. 4. Send footers. 34 525x ch28 1/24/03 2:55 PM Page 627 628 Chapter 28 Building a Mailing List Manager Almost all of the application’s processing is done in this file.The application also uses the function libraries listed in Table 28.1, as mentioned previously. The full listing of the index.php script is shown in Listing 28.2. Listing 28.2 index.php—Main Application File for Pyramid-MLM <?php /********************************************************************** * Section 1 : pre-processing *********************************************************************/ include ('include_fns.php'); session_start(); $action = $HTTP_GET_VARS['action']; $buttons = array(); //append to this string if anything processed before header has output $status = ''; // need to process log in or out requests before anything else if($HTTP_POST_VARS['email']&&$HTTP_POST_VARS['password']) { $login = login($HTTP_POST_VARS['email'], $HTTP_POST_VARS['password']); if($login == 'admin') { $status .= "<p><b>".get_real_name($HTTP_POST_VARS['email']). "</b> logged in"." successfully as <b>Administrator</b></p> <br /><br /><br /><br /><br />"; $HTTP_SESSION_VARS['admin_user'] = $HTTP_POST_VARS['email']; } else if($login == 'normal') { $status .= "<p><b>".get_real_name($HTTP_POST_VARS['email'])."</b> logged in" ." successfully.</p><br /><br />"; $HTTP_SESSION_VARS['normal_user'] = $HTTP_POST_VARS['email']; } else { $status .= "<p>Sorry, we could not log you in with that email address and password.</p><br />"; } } if($action == 'log-out') 34 525x ch28 1/24/03 2:55 PM Page 628 629 Script Architecture { unset($action); unset($HTTP_SESSION_VARS); session_destroy(); } /********************************************************************** * Section 2: set up and display headers *********************************************************************/ // set the buttons that will be on the tool bar if(check_normal_user()) { // if a normal user $buttons[0] = 'change-password'; $buttons[1] = 'account-settings'; $buttons[2] = 'show-my-lists'; $buttons[3] = 'show-other-lists'; $buttons[4] = 'log-out'; } else if(check_admin_user()) { // if an administrator $buttons[0] = 'change-password'; $buttons[1] = 'create-list'; $buttons[2] = 'create-mail'; $buttons[3] = 'view-mail'; $buttons[4] = 'log-out'; $buttons[5] = 'show-all-lists'; $buttons[6] = 'show-my-lists'; $buttons[7] = 'show-other-lists'; } else { // if not logged in at all $buttons[0] = 'new-account'; $buttons[1] = 'show-all-lists'; $buttons[4] = 'log-in'; } if($action) { // display header with application name and description of page or action do_html_header('Pyramid-MLM - '.format_action($action)); } Listing 28.2 Continued 34 525x ch28 1/24/03 2:55 PM Page 629 630 Chapter 28 Building a Mailing List Manager else { // display header with just application name do_html_header('Pyramid-MLM'); } display_toolbar($buttons); //display any text generated by functions called before header echo $status; /********************************************************************** * Section 3: perform action *********************************************************************/ // only these actions can be done if not logged in switch ( $action ) { case 'new-account' : { // get rid of session variables session_destroy(); display_account_form(); break; } case 'store-account' : { if (store_account($HTTP_SESSION_VARS['normal_user'], $HTTP_SESSION_VARS['admin_user'], $HTTP_POST_VARS)) $action = ''; if(!check_logged_in()) display_login_form($action); break; } case 'log-in' : case '': { if(!check_logged_in()) display_login_form($action); break; } case 'show-all-lists' : { display_items('All Lists', get_all_lists(), 'information', 'show-archive',''); break; Listing 28.2 Continued 34 525x ch28 1/24/03 2:55 PM Page 630 631 Script Architecture } case 'show-archive' : { display_items('Archive For '.get_list_name($HTTP_GET_VARS['id']), get_archive($HTTP_GET_VARS['id']), 'view-html', 'view-text', ''); break; } case 'information' : { display_information($HTTP_GET_VARS['id']); break; } } //all other actions require user to be logged in if(check_logged_in()) { switch ( $action ) { case 'account-settings' : { display_account_form(get_email(), get_real_name(get_email()), get_mimetype(get_email())); break; } case 'show-other-lists' : { display_items('Unsubscribed Lists', get_unsubscribed_lists(get_email()), 'information', 'show-archive', 'subscribe'); break; } case 'subscribe' : { subscribe(get_email(), $HTTP_GET_VARS['id']); display_items('Subscribed Lists', get_subscribed_lists(get_email()), 'information', 'show-archive', 'unsubscribe'); break; } case 'unsubscribe' : { unsubscribe(get_email(), $HTTP_GET_VARS['id']); display_items('Subscribed Lists', get_subscribed_lists(get_email()), 'information', 'show-archive', 'unsubscribe'); Listing 28.2 Continued 34 525x ch28 1/24/03 2:55 PM Page 631 . 'change-password'; $buttons[1] = 'account-settings'; $buttons[2] = 'show-my-lists'; $buttons[3] = 'show-other-lists'; $buttons[4] = 'log-out';. 'log-out'; $buttons[5] = 'show-all-lists'; $buttons[6] = 'show-my-lists'; $buttons[7] = 'show-other-lists'; } else { // if not logged in at all $buttons[0] = 'new-account';. 'show-all-lists'; $buttons[4] = 'log-in'; } if($action) { // display header with application name and description of page or action do_html_header('Pyramid-MLM - '.format_action($action)); } Listing