Practical PHP and MySQLBuilding Eight Dynamic Web Applications phần 9 pps

403 CHAPTER 10 Building a Re-Usable Project break; case "screenshots": if(!$_POST) { include_header(); menu_options(); } require("project_adminaddscreenshot.php"); break; Add the delete screenshots block: break; case "deletescreenshot": if(isset($_GET['conf']) == FALSE) { include_header(); menu_options(); } require("project_admindeletescreenshot.php"); break; If no legitimate setting was passed to the func GET variable, the default block is entered. This code asks the user which project she would like to administer. When a user has selected a project, the SESS_PROJECTID and SESS_PROJECTPATH session variables are created. These variables track the project in which the user is interested. First, check to see if SESS_PROJECTID is already set and a project already chosen: break; default: if($_SESSION['SESS_PROJECTID']) { header("Location: " . $config_projectadminbasedir . basename($SCRIPT_NAME) . "?func=main"); } If the variable exists, the page simply redirects to the main block. If the variable does not exist, ask the user to choose a project: header("Location: " . $config_projectadminbasedir . basename($SCRIPT_NAME) . "?func=main"); } else { include_header(); echo "<h1>Choose a project</h1>"; echo "<p>Which project would you like to administer?</p>"; 404 Practical PHP and MySQL $projsql = "SELECT * FROM homeproject_projects;"; $projresult = mysql_query($projsql); $projnumrows = mysql_num_rows($projresult); Here you perform a query to gather the available projects. Check if any rows were returned: $projnumrows = mysql_num_rows($projresult); if($projnumrows == 0) { echo "<p>No projects!</p>"; } If no rows are returned, there are no projects on the system. If projects exist, display them to the user: echo "<p>No projects!</p>"; } else { echo "<ul>"; while($projrow = mysql_fetch_assoc($projresult)) { echo "<li><a href='" . $SCRIPT_NAME . "?func=setproject&id=" . $projrow['id'] . "'>" . $projrow['name'] . "</a></li>"; } echo "</ul>"; } Each project links to the setproject block and passes the id of project as the id GET variable. If the user wants to create a new project, add a link to do so: echo "</ul>"; } echo "<a href='" . $SCRIPT_NAME . "?func=newproject'> Create a new project</a>"; } break; } Add the setproject block: break; } case "setproject": $pathsql = "SELECT * FROM homeproject_projects WHERE id = " . $validid . ";"; 405 CHAPTER 10 Building a Re-Usable Project $pathresult = mysql_query($pathsql); $pathrow = mysql_fetch_assoc($pathresult); session_register("SESS_PROJECTID"); session_register("SESS_PROJECTPATH"); $_SESSION['SESS_PROJECTID'] = $validid; $_SESSION['SESS_PROJECTPATH'] = $pathrow['pathname']; header("Location: " . $config_projectadminbasedir . basename($SCRIPT_NAME) . "?func=main"); break; Here a query returns the record from homeprojects_projects, with the id passed in the id GET variable. The session variables are then created, and the page redi- rects to the main block. Add the changeproject block: break; case "changeproject": session_destroy(); header("Location: " . $config_projectadminbasedir . basename($SCRIPT_NAME)); break; When the user clicks the Admin Another Project option, the session is destroyed and the page redirects to allow another project to be chosen. Finally, add the main block: break; case "main": include_header(); $projsql = "SELECT * FROM homeproject_projects WHERE id = " . $_SESSION['SESS_PROJECTID'] . ";"; $projresult = mysql_query($projsql); $projrow = mysql_fetch_assoc($projresult); echo "<h1>" . $projrow['name'] . " Administration</h1>"; menu_options(); exit; break; This code simply displays the name of the project to be administered. 406 Practical PHP and MySQL CHANGING GENERAL SETTINGS Every project in the application includes some simple general settings. These include the project name, pathname, and description. This page provides a form with the existing details filled in and then updates the database entry. Create project_admingeneral.php and add the code shown in Example 10-8. EXAMPLE 10-8 This page is your common-or-garden form and database script. <?php require_once(" /project_functions.php"); pf_protect_admin_page(); $sql = "SELECT * FROM homeproject_projects WHERE id = " . $_SESSION['SESS_PROJECTID'] . ";"; $result = mysql_query($sql); $row = mysql_fetch_assoc($result); if($_POST['submit']) { $updsql = "UPDATE homeproject_projects SET" . " name = '" . pf_fix_slashes($_POST['name']) . "'" . ", about = '" . pf_fix_slashes($_POST['about']) . "'" . ", pathname = '" . pf_fix_slashes($_POST['pathname']) . "'" . " WHERE id =" . $_SESSION['SESS_PROJECTID'] . ";"; mysql_query($updsql); echo "<h1>Updated</h1>"; echo "Project settings have been updated."; } else { ?> <h1>Project Information</h1> <form action="<?php echo $SCRIPT_NAME; ?>?func=general" method="POST"> <table> <tr> <td>Project Name</td> <td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td> </tr> <tr> <td>Path Name</td> <td><input type="text" name="pathname" value="<?php echo $row['pathname'] ?>"></td> </tr> <tr> <td>Description</td> 407 CHAPTER 10 Building a Re-Usable Project FIGURE 10-6 A simple form makes it possible to change project settings. <td><textarea name="about" rows="10" cols="50"><?php echo $row['about'] ?></textarea></td> </tr> <tr> <td></td> <td><input type="submit" name="submit" value="Modify details"></td> </tr> </table> </form> <?php } ?> The completed form should look like as shown in Figure 10-6. MANAGING DOWNLOADS Possibly the most important feature to administer in a project is the capability to view the different versions and available downloads. Not only is this an essential feature, but also it is quite complex because the same pages presents two different types of functionality (managing versions and managing releases). Before you start coding the page, step back and identify how the feature should work. This will make understanding the code easier. Administering downloads is performed in the interface shown in Figure 10-7. 408 Practical PHP and MySQL FIGURE 10-8 The version form appears inside the interface. FIGURE 10-9 Adding releases is as simple as clicking the link and filling in the form. FIGURE 10-7 A simple interface allows you to manage ver- sions and releases in a single page. Inside the table, you can see the version numbers, releases, and links to add a new content. Instead of clicking a link and being directed to a different page to add the version or release, it makes better sense to replace the link with the form. As such, when you click the Add a New Version link, you see the result shown in Fig- ure 10-8. Similarly, when you click the Add a New Release link, you see the result shown in Figure 10-9. 409 CHAPTER 10 Building a Re-Usable Project The complexity in the code does not specifically lie in difficult or complex statements but in lots of nested blocks checking different conditions and respond- ing accordingly. It is recommended that you add the entire code first and then reread the instructions of how it works. Create a new file called project_admindownloads.php and begin adding the code. Begin by displaying the interface shown in Figure 10-7 (you can process the forms later): $versql = "SELECT * FROM homeproject_releaseversions WHERE project_id = " . $_SESSION['SESS_PROJECTID'] . " ORDER BY id DESC;"; $verresult = mysql_query($versql); $vernumrows = mysql_num_rows($verresult); echo "<h1>Manage Downloads</h1>"; You begin by selecting all of the versions associated with the current project. Open the table and add the first row: echo "<h1>Manage Downloads</h1>"; echo "<table border=1 cellpadding=5>"; echo "<tr><td colspan=3>"; The first row can contain either the Add a New Version link or the form to add the version. If the user clicks the link, an addver GET variable is sent to the page. As such, check if this variable exists. If it does, display the form; otherwise, display the link: echo "<tr><td colspan=3>"; if($_GET['addver']) { echo "<form action='" . $SCRIPT_NAME . "?func=downloads' method='POST'>"; echo "<strong>New Release Number: "; echo "<input type='text' name='version'>"; echo "<input type='submit' value='Add' name='versubmit'>"; echo "</form>"; } else { echo "<a href='" . $SCRIPT_NAME . "?func=downloads&addver=1'> Add a New Version</a>"; } echo "</td></tr>"; With the first row complete, iterate through the versions. First, check if any ver- sions were returned from the query: 410 Practical PHP and MySQL NOTE Get the Right Submit Button The Submit button in the form is named versubmit. This page has two Sub- mit buttons (one for the version and one for the releases), and you need to be able to distinguish which one is clicked. echo "</td></tr>"; if($vernumrows == 0) { echo "<tr><td colspan=2>This project has no versions or releases.</td></tr>"; } If no rows are present, a message indicates that no versions or releases exist. If rows are presents, display them: echo "<tr><td colspan=2>This project has no versions or releases.</td></tr>"; } else { while($verrow = mysql_fetch_assoc($verresult)) { echo "<tr>"; echo "<td><strong>" . $verrow['version'] . "</strong></td>"; echo "<td>"; $relsql = "SELECT homeproject_releasefiles.id, homeproject_releasefiles.filename, homeproject_releasefiles.date, homeproject_releasetypes.type FROM homeproject_releaseversions INNER JOIN homeproject_releasefiles ON homeproject_releasefiles.version_id = homeproject_releaseversions.id INNER JOIN homeproject_releasetypes ON homeproject_releasefiles.type_id = homeproject_releasetypes.id WHERE homeproject_releaseversions.id = " . $verrow['id']; $relresult = mysql_query($relsql); $relnumrows = mysql_num_rows($relresult); In this case, you add the version number in the first cell and then run a query to gather the releases available for that version. This query returns the id, filename, date, and type for each version by performing an inner join to hook together the homeproject_releaseversions, homeproject_releasefiles, and homeproject_releasetypes tables. Check if any releases are returned and display them accordingly: $relnumrows = mysql_num_rows($relresult); if($relnumrows == 0) { 411 CHAPTER 10 Building a Re-Usable Project echo "No releases!"; } else { while($relrow = mysql_fetch_assoc($relresult)) { echo "[<a href='" . $SCRIPT_NAME . "?func=deleterelease&relid=" . $relrow['id'] . "'>X</a>] <a href='releases/" . $relrow['filename'] . "'>" . $relrow['type'] . "</a><br>"; } } echo "</td>"; Next to each release, an X link is added so that the user can delete a release. This links to the deleterelease block and passes the id of the release. (This block is discussed later.) In the third cell, either an Add a New Release link or the form is displayed. When the link is clicked, an addrelver GET variable is added to the address bar that is set to the version id. If the version id for the current row is the same as the value as addrelver, the link on the current row was clicked. As such, you need to display the form: echo "</td>"; echo "<td>"; if($_GET['addrelver'] == $verrow['id']) { $typessql = "SELECT * FROM homeproject_releasetypes;"; $typesresult = mysql_query($typessql); echo "<form action='" . $SCRIPT_NAME . "?func=downloads&ver=" . $verrow['id'] . "' method='POST' enctype='multipart/form-data'>"; echo "<select name='type'>"; while($typesrow = mysql_fetch_assoc($typesresult)) { echo "<option value=" . $typesrow['id'] . ">" . $typesrow['type'] . "</option>"; } echo "</select>"; echo "<input type='file' name='releasefile'>"; echo "<input type='submit' value='Add' name='relsubmit'>"; echo "</form>"; } else { echo "<a href='" . $SCRIPT_NAME . "?func=downloads&addrelver=" . $verrow['id'] . "'>Add a New Release</a>"; } 412 Practical PHP and MySQL When the form is displayed, the select box contains a list of the types from the homeproject_releasetypes table. The Submit button is called relsubmit so that you can determine whether the user clicked the version or release Submit button. Close the remaining code: echo "<a href='" . $SCRIPT_NAME . "?func=downloads&addrelver=" . $verrow['id'] . "'>Add a New Release</a>"; } echo "</td>"; echo "</tr>"; } echo "<table>"; } With the main interface portions complete, you can focus on processing the form. Jump to the start of the file and begin adding the code: <?php require_once(" /project_functions.php"); pf_protect_admin_page(); $uploaddir = $config_projectdir . $_SESSION['SESS_PROJECTPATH'] . "/releases/"; After protecting the page, you set a variable called $uploaddir. This variable specifies the location where releases are uploaded. You want to upload files to the releases directory inside the project directory so that you can concatenate the $config_projectdir and SESS_PROJECTPATH variables and then add the releases directory. Begin processing the version form: $uploaddir = $config_projectdir . $_SESSION['SESS_PROJECTPATH'] . "/releases/"; if($_POST['versubmit']) { $addsql = "INSERT INTO homeproject_releaseversions(project_id, version) VALUES(" . $_SESSION['SESS_PROJECTID'] . ", '" . $_POST['version'] . "')"; mysql_query($addsql); header("Location: " . $config_projectadminbasedir . basename($SCRIPT_NAME) . "?func=downloads"); } [...]... and deleting images is simple and can be seen in Figure 10-10 415 416 Practical PHP and MySQL FIGURE 10-10 Adding and removing images is only a couple of clicks away The Browse button can be used to upload an image for the current project, and the Delete links can be used to blitz the image if no one likes it or if you accidentally upload pictures of your dog Create project_adminaddscreenshot .php and. .. guess the first step That’s right—you need to create the header, footer, and config files Create a directory called readallaboutit in your webroot and start with the configuration file 431 432 Practical PHP and MySQL Create config .php and add the code shown in Example 11-1 EXAMPLE 11-1 Nothing new here; just the same ‘ol config file < ?php $dbhost = "localhost"; $dbuser = "root"; $dbpassword = ""; $dbdatabase... header file would include bar .php from that directory as opposed to the current one In index .php you have also taken out the line that includes project_bar .php so that you can put it in bar .php Create bar .php from the code in Example 10-14 and add it EXAMPLE 10-14 more integrated Adding the menu options to the sidebar makes the project feel < ?php require(" /project_bar .php" ); ?> The project is now set... but Read All About It is going to be the hottest new news Web site and you are, coincidentally, its founder In this chapter, you breathe life into Read All About It 425 426 Practical PHP and MySQL Although this project does not scratch the complexity and depth of Web sites such as those for BBC News or CNN, a number of new concepts to explore and features to build makes this simple site a worthwhile... this book INSTALLING PEAR PACKAGES The PEAR framework provides a stack of different PHP extensions that ease and automate the production of your sites You can find PEAR packages for Web services, XML, validation, form handling, and tons of other areas, and the huge and sprawling PEAR community constantly piles more and more packages into the system every week The Read All About It site makes extensive... installed PHP (such as C: /PHP) and run the following command: PHP go-pear.org In Linux, run the following command in a terminal or xterm (you need the Lynx Web browser installed to do this): foo@bar:~$ lynx –source go-pear.org | php In Mac OS X, run the following command in the Terminal: curl go-pear.org | sudo php When you run each of these commands, you are prompted to answer a number of questions... modify php. ini—the script should keep other parts of php. ini intact When the installation program is complete, the PEAR command-line tool becomes available to manage your PEAR packages In Windows, you may need to be inside your PHP directory to run the command, but on Linux and Mac OS X, you should be able to run it from anywhere In Linux and Mac OS X, you need to be the super-user to use the command... Web application To test how easily it embeds into an existing project, copy the Generic Web site project (from Chapter 3, Web Site Design”) to a directory called genericwithprojects Now copy all of the project code to a subdirectory inside genericwithprojects called projects The first step is to adjust phphomeprojectconfig .php for the new settings, as shown in Example 10-12 421 422 Practical PHP and. .. 10-11 and 10-12 to see the project in action FIGURE 10-11 When you deploy the project inside an existing application, the project seamlessly integrates 423 424 Practical PHP and MySQL FIGURE 10-12 The admin interface works well inside the existing design SUMMARY Creating re-usable Web applications is a tough job The challenge is not only in satisfying the day-to-day tasks such security, functionality, and. .. / /header .php" ); require(" /phphomeprojectconfig .php" ); $project = substr(dirname($SCRIPT_NAME), strrpos(dirname($SCRIPT_NAME), "/") + 1); CHAPTER 10 Building a Re-Usable Project require(" /project_main .php" ); require(" / /footer .php" ); ?> Inside this directory, you include the header and footer files with a relative location ( / /) You use a relative location so that you can include bar .php in the . step is to adjust phphomeprojectconfig .php for the new settings, as shown in Example 10-12. 422 Practical PHP and MySQL EXAMPLE 10-12 Change the path and URL-related settings. < ?php $dbhost =. fits together. The interface for adding and deleting images is simple and can be seen in Figure 10-10. 416 Practical PHP and MySQL FIGURE 10-10 Adding and removing images is only a couple of. project_admindeleterelease .php and add the code shown in Example 10 -9. EXAMPLE 10 -9 Deleting releases involves removing the file, removing the database record, and then redirecting. < ?php require_once("