Search

PHP & the MVC Pattern

Loading...

Flash Player 9 (or above) is needed to view presentations.
We have detected that you do not have it on your computer. To install it, go here.

2 comments

Comments 1 - 2 of 2 previous next Post a comment

  • + patrick.allaert Patrick Allaert 1 month ago
    Thanks Stefan for your comment.

    Before I comment, note that those slides have been used as an introduction to MVC with an audience that might be new to PHP and/or programming.

    I fully agree with you on the fact that 'model' is not equal to 'data access'. But not that it is in ’no way’ related. Quoting Wikipedia again:
    'MVC does not specifically mention the data access layer because it is understood to be underneath or encapsulated by the model. Models are not data access objects although in very simple apps, with little domain logic, there is no real distinction to be made.'

    In some very simple case you may simplify the domain logic of an application to an ActiveRecord pattern merging domain logic and data access.

    Separating business logic and data access is certainly a good practice I would recommend too, but as with any application design, there is no such thing as 'One Theory to Fit them All'. In some more complex case you might even want to have a three-tier architecture where the PHP application is only used as the presentation tier.
  • + spriebsch Stefan Priebsch 1 month ago
    I disagree with the diagram you show on slide #4. 'Model' in MVC has nothing to do with data access, but is a part of the logic layer of an application. It’s a common misconception, by the way, but if you read the wikipedia quote on the third slide carefully, you’ll notice that it does not mention data access at all, but only business logic. And I’m sure you’ll agree that you also want to separate business logic and data access ;-)
Post a comment
Embed Video
Edit your comment Cancel

Notes on slide 1

Favorites, Groups & Events

PHP & the MVC Pattern - Presentation Transcript

  1. PHPBelgium event 2009-06-24 PHP & the MVC Pattern http://joind.in/609 Patrick Allaert PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  2. About Me Started developping using PHP 3 Ten years of FOSS evangelism Contribute to different FOSS: Tabellio (Open Source Collaboration for assemblies) Xoo°f (eXtensible Open Object Oriented Framework) KDESvn (Subversion frontend for KDE) PHP (ext/ldap) APM lead developer (Alternative PHP Monitor) Working @ AUSY PHPBelgium staff member Blog: http://patrickallaert.blogspot.com/ Twitter: http://twitter.com/patrick_allaert PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  3. Model-View-Controller (1) “… is an architectural pattern used in software engineering. Successful use of the pattern isolates business logic from user interface considerations, resulting in an application where it is easier to modify either the visual appearance of the application or the underlying business rules without affecting the other.” Wikipedia PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  4. Model-View-Controller (2) Model DB Requests Controller (X)HTML View XML PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  5. Design of some PHP applications PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  6. Managing this is sometimes... very difficult... PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  7. Demo application /index.php /team.php?id=<TeamID> PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  8. Spaghetti code <?php <table id="ranking"> $db = new mysqli("localhost", "foot", "footpw", "foot");   <tr> $result = $db->query(     <th>Name</th>Presentation     <th>Points</th> "SELECT name, won, lost, draw, coach,   </tr> Business Logic won * 3 + draw AS points <?php FROM team WHERE id = " . (int) $_GET['id']); Business Logic $result = $db->query("SELECT * FROM ranking"); while ($row = $result->fetch_assoc()) { $team = $result->fetch_assoc(); ?> ?>   <tr> <html>     <td class="name"> <head>       <a href="team.php?id=<?= $row['id'] ?>">   <title>Team - <?= $team['name'] ?></title>         <?= $row['name'] ?> </head>       </a> <body id="team">     </td> <h1>Team: <?= $team['name'] ?></h1>     <td class="points"> <table id="info"> <?= $row['points'] ?> Presentation   <tr><th>Won:</th>   <td><?= $team['won'] ?></td></tr> </td> Presentation   <tr><th>Lost:</th>  <td><?= $team['lost'] ?></td></tr>   </tr>   <tr><th>Draw:</th>  <td><?= $team['draw'] ?></td></tr> <?php   <tr><th>Points:</th><td><?= $team['points'] ? } ></td></tr> ?>   <tr><th>Coach:</th> <td><?= $team['coach'] ?></td></tr> </table> </table> <a href="/">Ranking</a> </body> </html> PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  9. Taking the Business Logic apart (1) PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  10. Taking the Business Logic apart (2) class Team {   public static function getInformationById($id) {     return Database::getInstance() ->query(       "SELECT name, won, lost, draw, coach, won*3+draw AS points " .       "FROM team WHERE id = " . (int) $id) ->fetch_assoc();   } } class Ranking {   public static function generate() {     return Database::getInstance() ->query("SELECT * FROM ranking") ->fetch_all();   } } class Database {   public static function getInstance() {     static $connection = null;     if ($connection === null) {       $connection = new mysqli("localhost", "foot", "footpw", "foot");     }     return $connection;   } } PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  11. Taking the Business Logic apart (3) $position = 1; foreach (Ranking::generate() as $team) { ?>     <tr>         <td class="position"><?= $position++ ?></td>         <td class="name"><a href="team.php?id=<?= $team['id'] ?>"><?= $team['name'] ?></a></td>         <td class="played"><?= $team['played'] ?></td>         <td class="won"><?= $team['won'] ?></td>         <td class="lost"><?= $team['lost'] ?></td>         <td class="draw"><?= $team['draw'] ?></td>         <td class="points"><?= $team['points'] ?></td>     </tr> <?php } <?php require 'Team.php'; require 'Ranking.php'; $team = Team::getInformationById($_GET['id']); ?> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> foreach (Ranking::generate() as $row) { ?>     <tr<?php if ($row['id'] === $_GET['id']) { ?> class="selected"<?php } ?>>         <td class="name"><a href="team.php?id=<?= $row['id'] ?>"><?= $row['name'] ?></a></td>         <td class="points"><?= $row['points'] ?></td>     </tr> <?php } PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  12. Evaluating the situation Model is reusable Views tightly linked to Changes to the the model business logic does Views impacted if the not require inspecting API of the model all files change Calls to the model may be difficult to find: spread everywhere in views PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  13. On the path to MVC (1) <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head>   <title>Team - <?= $GLOBALS['team']['name'] ?></title> </head> <body id="team"> <h1>Team: <?= $GLOBALS['team']['name'] ?></h1> <table id="info">   <tr><th>Won:</th>   <td><?= $GLOBALS['team']['won'] ?></td></tr>   <tr><th>Lost:</th>  <td><?= $GLOBALS['team']['lost'] ?></td></tr>   <tr><th>Draw:</th>  <td><?= $GLOBALS['team']['draw'] ?></td></tr>   <tr><th>Points:</th><td><?= $GLOBALS['team']['points'] ?></td></tr>   <tr><th>Coach:</th> <td><?= $GLOBALS['team']['coach'] ?></td></tr> </table> <table id="ranking">   <tr> <?php     <th>Name</th><th>Points</th> require 'Ranking.php';   </tr> <?php // View variables foreach ($GLOBALS['ranking'] as $row) { $ranking = Ranking::generate(); ?>   <tr> require 'home.tpl';     <td class="name"> <a href="team.php?id=<?= $row['id'] ?>"><?= $row['name'] ?></a> <?php </td> require 'Team.php';     <td class="points"><?= $row['points'] ?></td> require 'Ranking.php';   </tr> <?php // View variables } $teamId = $_GET['id']; ?> $team = Team::getInformationById($teamId); </table> $ranking = Ranking::generate(); </body> </html> require 'team.tpl'; PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  14. On the path to MVC (2) View parameters are passed using global variables Hint: $variableName may also be written: $GLOBALS['variableName'] The latest form may be used to differentiate variables defined by the controller file from the local view variables “htdocs” could be renamed “controllers” PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  15. Howto: Clean URL Clean URL: Transforming http://example.com/index.php?type=article&id=25&date=20020322 into: http://example.com/article/200203226 Enables better search engine indexing URIs are not supposed to change (Cool URIs don't change) Doesn't expose the server-side language Most MVC Frameworks provide clean URL mechanism, how to setup one with our structure? PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  16. Clean URL: method #1 Using Apache's mod_rewrite: RewriteEngine On RewriteRule ^/team/([0-9]*)$ /team.php?id=$1 [L] Ability to transform URLs on the fly and mapping part of the URL directly to a $_GET variable PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  17. Clean URL: method #2 Dropping the “.php” extension and forcing the mime-type/handler used in the Apache configuration <FilesMatch "^(index|team)$"> ForceType application/x-httpd-php </FilesMatch> or: <FilesMatch "^(index|team)$"> SetHandler application/x-httpd-php </FilesMatch> PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  18. Performance impact (index page) Concurrency 1 15 “spaghetti” 1776.65 3545.77 Model-View 1615.43 3137.52 MVC 1602.57 3091.74 Clean URL #1 1554.86 3032.25 Clean URL #2 1686.85 3294.60 Zend Framework 246.36 421.15 In requests/second, higher = better PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  19. Performance impact (team page) Concurrency 1 15 “spaghetti” 1778.89 3507.61 Model-View 1580.92 3065.41 MVC 1546.32 3032.64 Clean URL #1 1519.59 2986.12 Clean URL #2 1465.43 2896.54 Zend Framework 233.94 402.54 In requests/second, higher = better PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  20. Questions ? PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  21. Thanks :-) These slides will be available through: http://patrickallaert.blogspot.com/ You can vote for this talk on: http://joind.in/609 PHPBelgium – Belgian PHP community http://www.phpbelgium.be/
  22. License This presentation material is published under the Creative Commons Attribution-Share Alike 3.0 Unported license. You are free: to Share — to copy, distribute and transmit the work to Remix — to adapt the work Under the following conditions: Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Share Alike — If you alter, transform, or build upon this work, you may distribute the resulting work only under the same, similar or a compatible license. With the understanding that: Waiver — Any of the above conditions can be waived if you get permission from the copyright holder. Other Rights — In no way are any of the following rights affected by the license: Your fair dealing or fair use rights; The author's moral rights; Rights other persons may have either in the work itself or in how the work is used, such as publicity or privacy rights. Notice — For any reuse or distribution, you must make clear to others the license terms of this work. PHPBelgium – Belgian PHP community http://www.phpbelgium.be/

+ Patrick AllaertPatrick Allaert, 5 months ago

custom

1235 views, 0 favs, 0 embeds more stats

Presentation done on June the 24th on the MVC patte more

More info about this document

CC Attribution-ShareAlike LicenseCC Attribution-ShareAlike License

Go to text version

  • Total Views 1235
    • 1235 on SlideShare
    • 0 from embeds
  • Comments 2
  • Favorites 0
  • Downloads 56
Most viewed embeds

more

All embeds

less

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate. If needed, use the feedback form to let us know more details.

Cancel
File a copyright complaint
Having problems? Go to our helpdesk?

Categories

Tags

-->
Search
RSS Feed
What's new?

© 2009 SlideShare Inc. All Rights Reserved