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MVC = Make Venerated Code?


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Presentation done on February the 18th on the MVC pattern at the first event of PHPBelgium in Liège.
The idea was to transform a simple spaghetti application into a well structured, MVC-aware and framework-free application with nice URL just using regular PHP and Apache's configuration.

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MVC = Make Venerated Code?

  1. 1. PHPBelgium event 18-02-2009 MVC = Make Venerated Code? Patrick Allaert PHPBelgium – Belgian PHP community
  2. 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: Twitter: PHPBelgium – Belgian PHP community
  3. 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
  4. 4. Model-View-Controller (2) Model DB Requests Controller (X)HTML View XML PHPBelgium – Belgian PHP community
  5. 5. Design of some PHP applications PHPBelgium – Belgian PHP community
  6. 6. Managing this is sometimes... very difficult... PHPBelgium – Belgian PHP community
  7. 7. Demo application /index.php /team.php?id=<TeamID> PHPBelgium – Belgian PHP community
  8. 8. Spaghetti code PHPBelgium – Belgian PHP community
  9. 9. Taking the Business Logic apart (1) PHPBelgium – Belgian PHP community
  10. 10. Taking the Business Logic apart (2) PHPBelgium – Belgian PHP community
  11. 11. Taking the Business Logic apart (3) PHPBelgium – Belgian PHP community
  12. 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
  13. 13. On the path to MVC (1) PHPBelgium – Belgian PHP community
  14. 14. On the path to MVC (2) Directory views to be added in the include_path View parameters are passed using global variables Hint: $variableName may also be written: $GLOBALS['variableName'] The latest form may be used to differentiate variables defined by the controller file from the local view variables “htdocs” could be renamed “controllers” PHPBelgium – Belgian PHP community
  15. 15. Howto: Clean URL Clean URL: Transforming Enables better search engine indexing URIs are not supposed to change (Cool URIs don't change) Doesn't expose the server-side language Most MVC Frameworks provide clean URL mechanism, how to setup one with our structure? PHPBelgium – Belgian PHP community
  16. 16. Clean URL: method #1 Using Apache's mod_rewrite: RewriteEngine On RewriteRule ^/team/([0-9]*)$ /team.php?id=$1 [L] Ability to transform URLs on the fly and mapping part of the URL directly to a $_GET variable PHPBelgium – Belgian PHP community
  17. 17. Clean URL: method #2 Dropping the “.php” extension and forcing the mime-type/handler used in the Apache configuration <FilesMatch "^(index|team)$"> ForceType application/x-httpd-php </FilesMatch> or: <FilesMatch "^(index|team)$"> SetHandler application/x-httpd-php </FilesMatch> PHPBelgium – Belgian PHP community
  18. 18. Performance impact (index page) Concurrency 1 15 “spaghetti” 1483.15 2798.23 Model-View 1353.17 2388.61 MVC 1339.72 2364.66 Clean URL #1 1320.61 2303.99 Clean URL #2 1412.43 2468.83 Zend Framework 164.11 280.22 In requests/second, higher = better PHPBelgium – Belgian PHP community
  19. 19. Performance impact (team page) Concurrency 1 15 “spaghetti” 1372.66 2428.79 Model-View 1243.78 2142.79 MVC 1235.48 2364.66 Clean URL #1 1232.39 2090.51 Clean URL #2 1192.78 2040.44 Zend Framework 158.77 264.65 In requests/second, higher = better PHPBelgium – Belgian PHP community
  20. 20. Questions ? PHPBelgium – Belgian PHP community
  21. 21. Thanks :-) These slides will be available through: PHPBelgium – Belgian PHP community
  22. 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