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CodeIgniter 1.7

By : David Upton

4.1 (7)

CodeIgniter 1.7

4.1 (7)

By: David Upton

Overview of this book

CodeIgniter (CI) is a powerful open-source PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications. CodeIgniter is an MVC framework, similar in some ways to the Rails framework for Ruby, and is designed to enable, not overwhelm. This book explains how to work with CodeIgniter in a clear logical way. It is not a detailed guide to the syntax of CodeIgniter, but makes an ideal complement to the existing online CodeIgniter user guide, helping you grasp the bigger picture and bringing together many ideas to get your application development started as smoothly as possible. This book will start you from the basics, installing CodeIgniter, understanding its structure and the MVC pattern. You will also learn how to use some of the most important CodeIgniter libraries and helpers, upload it to a shared server, and take care of the most common problems. If you are new to CodeIgniter, this book will guide you from bottom to top. If you are an experienced developer or already know about CodeIgniter, here you will find ideas and code examples to compare to your own.

CodeIgniter 1.7

CodeIgniter 1.7

Credits

Credits

About the Authors

About the Authors

About the Reviewer

About the Reviewer

Preface

Preface

Free Chapter

Introduction to CodeIgniter

Introduction to CodeIgniter

What can CodeIgniter do for you?

What CI doesn't do

Yes, but…what is CodeIgniter? What are frameworks?

Comparing CI to other open source solutions (CakePHP and Joomla!)

License

Summary

Setting up a CodeIgniter Site

Setting up a CodeIgniter Site

Prerequisites

Installing CodeIgniter

Summary

Navigating Your Site

Navigating Your Site

MVC: Model-View-Controller

Summary

Using CI to Simplify Databases

Using CI to Simplify Databases

Configuration settings

Designing the database for our site

Active Record

Summary

Chapter appendix: MySQL query to set up the website's database

Simplifying HTML Pages and Forms

Simplifying HTML Pages and Forms

Writing a view

Long and short PHP syntax and other CodeIgniter style guidelines

Nesting views

Practical issues of site architecture

CI's form helper—entering data

My display model

CI's form validation class: Checking data easily

Summary

Simplifying Sessions and Security

Simplifying Sessions and Security

Continuing with our practical site using CI

Security/Sessions: Using another CI library class

Isn't there anything already built?

Security

Summary

CodeIgniter and Objects

CodeIgniter and Objects

Object-oriented programming

Summary

Improving Our Application with Third-Party Code

Improving Our Application with Third-Party Code

Creating a helper

Creating a library

Summary

Using CI to Communicate

Using CI to Communicate

Using the FTP class to test remote files

Machines talking to machines again: XML-RPC

Talking to humans for a change—the email class

Twitter

Summary

How CI Helps to Provide Dynamic Information

How CI Helps to Provide Dynamic Information

The date helper—converting and localizing dates

Working with text—the text helper

Making HTML tables the easy way—the Table class

Caching pages

Summary

Using CI to Handle Files and Images

Using CI to Handle Files and Images

The file helper

The download helper

The file upload class and CI's image class

CI's image class

Easy file compression with CI's zip class

Summary

Moving Your Site to the WWW

Moving Your Site to the WWW

Errors and error pages

So, should we update if a new version of CI comes out?

Summary

CRUD—or Putting It All Together

CRUD—or Putting It All Together

Building our CRUD controller, model, and views

Upgrading our CRUD

Summary

The Verdict on CI

The Verdict on CI

Organizing the files of our site

Organizing the logic of our site

Centralized configuration

Code conventions

Database tools

Simpler and more powerful code

Adding security to our site

Making our site more scalable and our code more reusable

Documentation and community

Summarizing all that CI offers

Summary

Resources and Extensions

Resources and Extensions

CI's user forums

Invoicing

Additional resources

Summary

Appendix

Appendix

What we need to use the library

Adding products to the cart

Showing the cart to our clients

Summary

Errors and error pages

While developing, it is a good idea to see programming errors that really help us. But it may not be a good idea letting our visitors to see those errors, for example, a missing semicolon would end up showing the following screen to our visitor:

While this helps you, you need to refrain from showing this to your visitors. Open your index.php file and find this line in it:

error_reporting(E_ALL);

Change it, or better comment it and add:

error_reporting(0);

Now, after uploading the file, no errors will be shown any more. But other errors such as "404 Page Not Found", will require some tweaking. We will try to make them more useful for our visitors, for example, if they try to load a non-existent controller they will see this screen:

This is of no help to our visitors. If we want to help them in case they reach that error page, we need to modify the application/errors/error_404.php file. When we open it we will see something like this:

<?php header("HTTP/1.1 404 Not...

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Programming languages

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