![CodeIgniter - [Overview]
CodeIgniter is a fast, minimalistic PHP 4/5 framework.](https://image.slidesharecdn.com/codeigniteroverview-160503170501/85/Code-igniter-overview-1-320.jpg)
![CodeIgniter Flow
index.php Error Reporting
System Folder
CodeIgniter CI Version
Commons
Common functions
Load functions
Intercept errors
Define custom error handlers
Config [App] Application Specific Configuration
Benchmarki
ng
Hooks](https://image.slidesharecdn.com/codeigniteroverview-160503170501/85/Code-igniter-overview-4-320.jpg)
Code igniter overview
- 1. CodeIgniter - [Overview] CodeIgniter is a fast, minimalistic PHP 4/5 framework.
- 2. MVC • CodeIgniter is built on a design pattern called MVC. • MVC stands for Model View Controller and is a common design pattern for web design. • Models encapsulate data and the manipulation thereof. • Views handle presentation of the Models. • Controllers handle routing, external libraries, and deciding which Model it’s going to send to which View.
- 3. “Under the Hood” • CodeIgniter works by building a “super object” on every call. • This makes the flow very easy to follow.
- 4. CodeIgniter Flow index.php Error Reporting System Folder CodeIgniter CI Version Commons Common functions Load functions Intercept errors Define custom error handlers Config [App] Application Specific Configuration Benchmarki ng Hooks
- 6. URI Patterns • URL’s are URI’s. URI’s are Uniform Resource Identifier • CodeIgniter uses the URI to determine what action to perform with the request. http:// www.example.co m /blog / index.php /view /10 http://www.example.com/index.php/blog/view/10 URL Domain File Controller Method (action) Parameters
- 7. Application Flow • Controller objects are created • This loads any libraries / helpers needed as well as any Models you intend to reference • Corresponding named function (action) is called and given any parameters present • This function typically loads views which are then displayed
- 8. ¡Expert Tip! • The unsightly index.php from the URI can be removed with a .htaccess rule RewriteEngine on # Turn RewriteEngine on if neededRewriteCond $1 !^(index.php|images|css|js) # Match everything except our non php filesRewriteCond % {HTTP_HOST} ^example.com # Only match one specific vhostRewriteRule ^(.*)$ /blog/index.php/basic/$1 # Magic!
- 9. MVC Design with CodeIgniter • CodeIgniter enforces MVC if a pretty lenient way. • You could write all your logic in Views if you wanted to. • You can completely disregard Models. • You shouldn’t misuse MVC. • It leads to problems down the road. Even if you aren’t planning on extending the Application.
- 10. Controllers • Controllers get called in response to a URL route • Controllers should take any given parameters and use them to create a Model. • This Model then gets passed to the View. • Do all Views have Models? Ideally, yes. However this is often impractical. • Use private functions to encapsulate repetitive logic. • Are you checking for $this->session->user every time and redirecting if not found? Put it into a private function and call $this->_require_user() instead.
- 11. Models • Models are objects. They typically interface with a data source. • Active Record gives Models database connectivity and query ability. • DataMapper (OZ) is has additional features if you need them. • Simplicity to the point of insanity.
- 12. Views • Views are almost 100% HTML. • A view takes information passed to it and splices those values into the HTML document. • Views are modular, you can load multiple views for any given request. • You can load views from other views • Create a directory structure that makes sense.
- 13. ¡Expert Tip! • Don’t use PHP short tags. They are from the devil. • Don’t write logic in your views. If this show that: Fine. If this show that create new User: NO! • Don’t ‘echo’ out HTML. This does not turn into a JSP where everything is escaped and written out anyway. This is HTML that is pre-processed by the PHP engine before being served. • Do write separate views for separate things. Listing a bunch of blog posts? foreach($posts as $post) { $this->load->view(‘shared/post’, $post); }
- 14. Libraries • Not full of books. • Libraries allow you to interface with external classes. • Session management • reCaptcha • API’s • Benchmarking, Calendar, Encryption, Forms, Profilers, URI, Validation, etc. • CodeIgniter has some very useful ones built in. Check them out.
- 15. Helpers • Globally available functions. • Use them in Controllers, Views, or Models.
- 16. Tying It All Together • CodeIgniter is a simple framework for you to build complex applications. • Questions?