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Programming with CodeIgniter MVC
Programming with CodeIgniter MVC

Programming with CodeIgniter MVC: Build feature-rich web applications using the CodeIgniter MVC framework

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Programming with CodeIgniter MVC

Chapter 2. Configurations and Naming Conventions

This chapter initially introduces the CI naming conventions. These conventions include the rules, style guide, and CodeIgniter naming spirit. The second part of this chapter will review CI project configurations for built-in resources as well as user-defined or third-party add-on libraries. Note that we will actually build our own project code in the subdirectory application described in Chapter 1, Getting Started, with optionally relative resource directories for our project's self-made resources, such as CSS / Media / jQuery libraries' resources or third-party add-ons, extending the base CI downloaded from the Ellis Labs site or GitHub.

We should remember that developing a CI project is done by replacing/expanding the default provided controllers, views, models, and other resources in a well-defined OOP fashion. We should extend controllers, models, and add additional views as well as use defined helpers or libraries. We can add these from...

CI directory tree


The following is the classic directory tree structure of CodeIgniter:

Note that when we add new plugins and other resources such as bootstrap, new directories of resources may be added with a name of your choice so that you can refer to them from the specific resource you are developing using the CI BASEPATH defined parameter as the directory path to the CI_PROJECT_ROOT directory.

If we add a new directory under the project root, let's say bootstrap, the path for including resources such as CSS, JavaScript, or images (for example, hello.png) will be $path = BASEPATH."bootstrap/hello.png".

config.php

The CI main configuration files have the following major configurations:

$config['base_url'] = '';

The default is an empty string so that CI can calculate the base URL of our project root directory. We shall refer to the base URL in many places in our code, mostly to execute controllers. To get the base URL, we should call:

$base_url = base_url();
// defined in the URL
// helper mentioned...

Defining and using your own configurations


CI enables us to define our own configurations and easily access them via the config class. For example, with application/config/my_config.php, let's say we define a parameter in that config file as follows:

$param1 = "value1";

We can easily access our configuration file parameters to load all the parameters into the array:

$array = $this->config->load('my_config', TRUE);

The second parameter, TRUE, assures us that our configuration parameters will be defined in an array prefixed with the configuration file name.

Consider: $param1 = $array['my_config']['param1'];

or: $param1 = $this->config->item('param1', 'my_config');.

$param1 will have the value value1 that we have set in the configuration file that we built.

Understanding and using CI naming conventions


The CI naming conventions are essential to understand and use, in order to properly develop with CI. They enable you to write minimal code using a strict and concise set of rules.

The full CI naming conventions and style guide can be found at http://codeigniter.com/user_guide/general/styleguide.html.

The naming conventions refer to the naming of parameters, functions/methods, class-related PHP file name storing code, project resource paths, and so on. Here are the specific issues we will review:

  • Extending CI resources such as the CI controller or model in our project resources (class extends class fashion—for example, extending CI_controller or CI_model; see the examples discussed in the Controller definition naming rules section)

  • Defining views and rendering them by a controller with or without providing parameters that the view code may use for its operation

  • Using existing general reusable resources (can be loaded from any controller or model and...

Miscellaneous naming conventions


CI guidelines have some general naming conventions, such as the following:

  • Your classes, functions, and parameters should have short names, and if constructed from several words they should use the underscore separator as follows:

    // several lowercase words naming with under score
    get_file_properties();
  • When defining a string value, in case the string does not have a parameter to evaluate, we shall use a single comma as follows:

    $my_string   = 'the string';
  • In case we want our string to have a parameter such as $name, we write our string using double quotes:

    $name = 'big string parameter';
    $my_string = "This is a $name ";
  • The Boolean and contacts all should be in upper case:

    $this_vale = FALSE;
    // While in javascript we shall use true / false 
    // to distinguish

For more general CI PHP style guide refer to http://codeigniter.com/user_guide/general/styleguide.html.

Summary


In this chapter we have reviewed and practiced CI naming conventions, rules, and usage with a set of examples for parameters, classes, controllers, models, helpers, libraries, and views.

Following the naming conventions we have reviewed CI configurations. We reviewed the major configuration files, such as config.php, database.php, autoload.php, and routes.php in depth. We also reviewed how we can use the configuration parameters while configuring several databases to be used in our project. In addition to it we also saw how we can add more project-specific configurations.

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Key benefits

  • Build feature-rich web applications using the CodeIgniter MVC framework
  • Master the concepts of maximum simplicity, separation, flexibility,reusability, and performance efficiency
  • A guick guide to programming using the CodeIgniter MVC framework

Description

The CodeIgniter Model-View-Controller framework provides genius simplicity, flexibility, and efficient resource usage, boosting performance and reusability. "Programming with CodeIgniter MVC" reviews the unique features of CodeIgniter using simple, easy-to-follow, and practical examples. Programming with CodeIgniter MVC provides a simple step-by-step guide to efficiently utilizingthe CodeIgniter MVC framework for developing web applications. This book is packed with engaging examples to understand the usage of controllers, libraries, and (Codeigniter) CI Models. This book commences with a quick discussion of the CodeIgniter Integration with  external plugins such as Flickr API, Google Maps and more will be reviewed with clear usage examples. It will then cover CI naming convention rules, mandatory and optional configurations, and usage within a CI project. It will also cover user defined configurations. By the end of this book, you will not only understand user-defined libraries in a CI framework, but also their services, role, usage, and scope with the help of an example-based approach. The book also covers helpers, models, and views, as well as their usage. Using this book, youwill soonbe able to develop feature-rich web applications using the CodeIgniter MVC framework. "Programming with CodeIgniter MVC" is a one-stop solution to developing solutions with CodeIgniter MVC.

Who is this book for?

This book is written for PHP developers who wish to learn how to use the CodeIgniterMVC framework for application development. No experience of CodeIgniteris necessary, as this book is for beginning MVC development.

What you will learn

  • Install CodeIgniter and get acquainted with CodeIgniter resource directories
  • Making your first web application
  • Definiing your own CodeIgniter libraries
  • Issuing AJAX calls of CodeIgniter controller methods
  • Learning about controllers, helpers, and their usage
  • Understandingthe CodeIgniter naming conventions
  • Accessing CodeIgniter-assigned databases and other resources from your helpers
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Publication date : Sep 23, 2013
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781849694704

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Product Details

Publication date : Sep 23, 2013
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781849694704

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Table of Contents

7 Chapters
Getting Started Chevron down icon Chevron up icon
Configurations and Naming Conventions Chevron down icon Chevron up icon
Controller Usage and Scope Chevron down icon Chevron up icon
Libraries Chevron down icon Chevron up icon
Helpers Chevron down icon Chevron up icon
Models Chevron down icon Chevron up icon
Views Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Half star icon Empty star icon Empty star icon Empty star icon 1.8
(5 Ratings)
5 star 0%
4 star 0%
3 star 20%
2 star 40%
1 star 40%
Eric D. Brown Mar 04, 2014
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
I took a chance on this book and I'm not that happy that I did. This book provides very little in the way of 'new' examples and definitely stays away from any in-depth discussions of CodeIgniter. There's nothing in this book that you can't find on the CI website.
Amazon Verified review Amazon
alex3410 Jan 12, 2018
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
First impressions are the information is good but the formatting is really really poor - code sections have not been formatted for print so lines run on to multiple lines making it hard to readNo spacing between sections of code also make it hard to read with it all forming huge blocks of textFinally you are presented with complete code samples explained with comments within the code rather then separate sections - these comments are not immediately obvious & again run over causing confusion as to if the text is part of the comment or codeIt’s annoying because the topics complex enough as it is without struggling with poor layoutUpdate : finished the book, poor formatting continues throughout & makes it harder to understand the examples, writing in places is poor which again makes it harder to understand.That being said it’s got useful information in there & worth reading if only because the number of books on CI development are slim
Amazon Verified review Amazon
Ola Klingberg Sep 12, 2014
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
This book might become worthy of three or ever four stars, once it’s finished, but this sloppily proof-read draft should not have been published. I’m at page 45, and I’m giving up now.Both the general text and the code examples are so littered with typos and misused words that they are often difficult to make sense of.The text reads “a single comma” when they mean “single quotes.” It says “The Boolean and contacts” when they mean “Booleans and constants.” The introduction to an example says that it “... creates a form for adding and editing a product” when in fact the example that follows is for a contact form that has nothing to do with any products. And the code often looks like this: function index () {// executed when referring to My_handlercontroller viaURLecho “Hello World”; }You have to look at that for a minute to figure out what is code and what is comment, since the lines have been muddled together.I’m thinking about requesting a refund, even though I’ve made some highlighting. This book was simply not ready to be sent to the printer.
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Dean Barker Mar 03, 2014
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The php code is not formatted correctly and is very difficult to follow. New lines are not new lines and the comments merge with the actual code in one big messy block. Never buying another tech book from Kindle again. Would get a refund if its possible but its been too ling since I bought.
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Amazon Customer Oct 29, 2017
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Useless
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