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Introduction To CodeIgniter

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This document provides an introduction and overview of CodeIgniter, an open source PHP web application framework. It discusses why developers would use a framework like CodeIgniter, including benefits like basic building blocks, separation of concerns, and easier testing. It describes CodeIgniter's MVC architecture and some of its core classes for database access, input handling, loading resources, and more. The document concludes with basic steps for creating a first CodeIgniter application.

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Introduction to CodeIgniter Steve Webb Refresh OKC 17 Jun 2008
What is CodeIgniter? CodeIgniter is a lightweight web application framework written in PHP that adopts the model-view-controller approach to development
Why use a framework? Web application frameworks provide basic building blocks needed by most applications Database connections Business logic Form handling Separation of concerns Easier testing (unit tests)
Why use CodeIgniter? Feature rich Lightweight Open source Well-supported by an active community Excellent “by example” documentation Easy to configure Supports multiple databases
Why use CodeIgniter? In short, CodeIgniter is nice because it does what it needs to do and then gets out of the way.
Model-View-Controller Model – representation of the data View – rendering of the data suitable for interaction with the user Controller – the “traffic cop” that passes model data to the views and vice versa This separation of concerns allows for greater flexibility, reuse of code, and overall preservation of the developer’s sanity
Controller A class containing one or more related methods (custom PHP functions) Typical uses: Request a set of data from the model by sending arguments Send a payload of data to a view (web page) Receive a data payload from a view Apply business logic to make decisions Pass data to the model for inclusion in a database
View Code that displays information to the user Views can be: Web pages with PHP code snippets inserted Web pages with forms to gather user input Other output (CSV, PDF, etc.)
Model A class containing one or more related methods (custom PHP functions) Typical uses: Create Read Update Delete
CodeIgniter Classes CI’s built-in classes contain the basic functionality that are frequently used by web applications The most-used classes are: Database Input Loader URI Validation
Database Class Generates queries using the Active Record Pattern Automatic escaping of input values Provides method “chaining” for easy query building $this->db->where(‘name’,$name);
Input Class Pre-processes user input (prevents common cross-site scripting techniques) Provides access to user input and other data: Form fields (POST) Cookies Server variables $this->input->post(‘fieldname’);
Loader Class Makes various resources available: Databases Views Helpers Plugins $this->load->view(‘viewname’);
URI Class Provides access to specific parts of the URI string Useful for building RESTful URIs $this->uri->segment(n);
Validation Class Helps validate user form input Required fields Required string formatting (length, regexp) Enables success and failure messages on form submittal Enables re-population of form fields after form submittal
Other Classes Benchmarking Calendaring Email Encryption File uploading FTP HTML Table Image Manipulation Language (internationalization) Output Pagination Session Trackback Unit testing XML-RPC Zip encoding
Helpers and Plugins CodeIgniter comes with a wide array of “helper” functions that add convenience to applications and provide ease of reuse. $this->load->helper(‘helper_name’); CodeIgniter also allows for the use of custom add-on functions called “plugins”. $this->load->plugin(‘plugin_name’);
My First CI Application Unzip CI zip file into application folder on web server [optional] For “pretty URLs”, add .htaccess file and enable mod_rewrite in Apache Configure database in CI’s <config.php> Write controller (or modify existing) Write view (or modify existing) Write model
Demo

More Related Content

Introduction To CodeIgniter

  • 1. Introduction to CodeIgniter Steve Webb Refresh OKC 17 Jun 2008
  • 2. What is CodeIgniter? CodeIgniter is a lightweight web application framework written in PHP that adopts the model-view-controller approach to development
  • 3. Why use a framework? Web application frameworks provide basic building blocks needed by most applications Database connections Business logic Form handling Separation of concerns Easier testing (unit tests)
  • 4. Why use CodeIgniter? Feature rich Lightweight Open source Well-supported by an active community Excellent “by example” documentation Easy to configure Supports multiple databases
  • 5. Why use CodeIgniter? In short, CodeIgniter is nice because it does what it needs to do and then gets out of the way.
  • 6. Model-View-Controller Model – representation of the data View – rendering of the data suitable for interaction with the user Controller – the “traffic cop” that passes model data to the views and vice versa This separation of concerns allows for greater flexibility, reuse of code, and overall preservation of the developer’s sanity
  • 7. Controller A class containing one or more related methods (custom PHP functions) Typical uses: Request a set of data from the model by sending arguments Send a payload of data to a view (web page) Receive a data payload from a view Apply business logic to make decisions Pass data to the model for inclusion in a database
  • 8. View Code that displays information to the user Views can be: Web pages with PHP code snippets inserted Web pages with forms to gather user input Other output (CSV, PDF, etc.)
  • 9. Model A class containing one or more related methods (custom PHP functions) Typical uses: Create Read Update Delete
  • 10. CodeIgniter Classes CI’s built-in classes contain the basic functionality that are frequently used by web applications The most-used classes are: Database Input Loader URI Validation
  • 11. Database Class Generates queries using the Active Record Pattern Automatic escaping of input values Provides method “chaining” for easy query building $this->db->where(‘name’,$name);
  • 12. Input Class Pre-processes user input (prevents common cross-site scripting techniques) Provides access to user input and other data: Form fields (POST) Cookies Server variables $this->input->post(‘fieldname’);
  • 13. Loader Class Makes various resources available: Databases Views Helpers Plugins $this->load->view(‘viewname’);
  • 14. URI Class Provides access to specific parts of the URI string Useful for building RESTful URIs $this->uri->segment(n);
  • 15. Validation Class Helps validate user form input Required fields Required string formatting (length, regexp) Enables success and failure messages on form submittal Enables re-population of form fields after form submittal
  • 16. Other Classes Benchmarking Calendaring Email Encryption File uploading FTP HTML Table Image Manipulation Language (internationalization) Output Pagination Session Trackback Unit testing XML-RPC Zip encoding
  • 17. Helpers and Plugins CodeIgniter comes with a wide array of “helper” functions that add convenience to applications and provide ease of reuse. $this->load->helper(‘helper_name’); CodeIgniter also allows for the use of custom add-on functions called “plugins”. $this->load->plugin(‘plugin_name’);
  • 18. My First CI Application Unzip CI zip file into application folder on web server [optional] For “pretty URLs”, add .htaccess file and enable mod_rewrite in Apache Configure database in CI’s <config.php> Write controller (or modify existing) Write view (or modify existing) Write model
  • 19. Demo