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Home > Web Development > Server Side Web Development > CodeIgniter Web Application Blueprints
CodeIgniter Web Application Blueprints
CodeIgniter Web Application Blueprints

CodeIgniter Web Application Blueprints: Develop full-featured dynamic web applications using the powerful CodeIgniter MVC framework

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Profile Icon Robert Foster
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$39.19 $48.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8 (6 Ratings)
Paperback Jan 2015 330 pages 1st Edition
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CodeIgniter Web Application Blueprints

Chapter 2. A URL Shortener

There are quite a few URL shorteners out there on the Internet; however, there's always room for a little fun and sometimes people or companies require their own solutions rather than just using an external provider. The project in this chapter covers just that—developing a URL shortener in CodeIgniter that can be used by anyone.

To make this app, we'll need to do a few things: we'll create two controllers, one to create a shortened URL and one to redirect a shortened URL to its actual location on the Web.

We'll create language files to store text, creating a foundation for multiple language support should you wish to implement it.

We will also make amends to the config/routes.php file—this is to ensure that the shortened URL is as short as it can be.

However, this app, along with all the others in this book, relies on the basic setup we did in Chapter 1, Introduction and Shared Project Resources; although you can take large...

Design and wireframes

Before we start building, we should always take a look at what we plan to build.

Firstly, a brief description of our intent: we plan to build an app that will display a simple form to the user. The user will be encouraged to enter a URL into the form and submit that form.

A unique code will be generated and associated with the URL entered by the user. This URL and unique code will be saved to a database.

A new URL will be shown to the user containing the unique code we just generated. That unique code will be appended to the URL of the app we're building. Should the user (or anyone else) click on that link, the app will look up the unique code in the database. If the unique code exists, it will redirect the user to the original URL associated with that unique code.

So, let's take a look at some wireframes to help us understand what this might look like on screen:

Design and wireframes

This is the first page that the user will see. The user is invited to enter a URL into the textbox...

Creating the database

Okay, you should have already set up CodeIgniter and Bootstrap as described in Chapter 1, Introduction and Shared Project Resources. If not, then you should know that the code in this chapter is specifically built with the setup from Chapter 1, Introduction and Shared Project Resources, in mind. However, it's not the end of the world—the code can easily be applied to other situations.

Firstly, we'll build the database. Copy out the following MySQL code into your database:

CREATE DATABASE `urls`;
USE `urls`;

CREATE TABLE `urls` (
  `url_id` int(11) NOT NULL AUTO_INCREMENT,
  `url_code` varchar(10) NOT NULL,
  `url_address` text NOT NULL,
  `url_created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`url_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

Tip

You don't have to call the database urls if you don't want to. Feel free to rename to something else if you wish; just be sure to update the config/database.php...

Adjusting the routes.php file

We want short URLs—in fact the shorter the better. The user clicking on a URL would be better served if the URL were as short as possible; for that reason, it would be a good idea if we removed certain things from the URL to make it shorter—for example, the controller name and function name. We will use CodeIgniter's routing functionality to achieve this. This can be done as follows:

  1. Open the config/routes.php file for editing and find the following lines (near the bottom of the file):
    $route['default_controller'] = "welcome";
$route['404_override'] = '';
  2. Firstly, we need to change the default controller. Initially, in a CodeIgniter application, the default controller is set to welcome. However, we don't need that; instead we want the default controller to be create. So, consider the following line:
    $route['default_controller'] = "welcome";

    Replace it with the following code:

    $route...

Creating the model

The Urls_model contains three functions; obviously it contains our __construct() function but we're not focusing on that at the moment as it's not doing anything except referencing its parent.

Instead, let's look at the two functions save_url() and fetch_url(). As their names suggest, one saves information to the database and the other fetches information from it. For now, let's go and create the code and we'll discuss in detail what each function does later:
Create the urls_model.php model file and add the following code to it:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Urls_model extends CI_Model {
  function __construct() {
    parent::__construct();
  }

  function save_url($data) {
    /*
    Let's see if the unique code already exists in 
    the database.  If it does exist then make a new 
    one and we'll check if that exists too.  
    Keep making new ones until...

Creating views

We're going to create two view files in this section, as follows:

  • /path/to/codeigniter/application/models/views/create/create.php
  • /path/to/codeigniter/application/models/views/nav/top_nav.php

Don't forget that the navigation file (views/nav/top_nav.php) is unique to each chapter in this book.

Creating the view file–views/create/create.php

The create.php file is the view file that the user creating the shortened URL will see; it contains the HTML form the user will enter the original URL into and any interactive elements such as error or success messages.

Create the create/create.php view file and add the following code to it:

      <div class="page-header">
        <h1><?php echo $this->lang->line('system_system_name'); ?></h1>
      </div>

      <p><?php echo $this->lang->line('encode_instruction_1'); ?></p>

      <?php if (validation_errors()) : ?>
        <?php...

Design and wireframes

Before we start building, we should always take a look at what we plan to build.

Firstly, a brief description of our intent: we plan to build an app that will display a simple form to the user. The user will be encouraged to enter a URL into the form and submit that form.

A unique code will be generated and associated with the URL entered by the user. This URL and unique code will be saved to a database.

A new URL will be shown to the user containing the unique code we just generated. That unique code will be appended to the URL of the app we're building. Should the user (or anyone else) click on that link, the app will look up the unique code in the database. If the unique code exists, it will redirect the user to the original URL associated with that unique code.

So, let's take a look at some wireframes to help us understand what this might look like on screen:

This is the first page that the user will see. The user is invited to enter a URL into the textbox and hit the...

Creating the database

Okay, you should have already set up CodeIgniter and Bootstrap as described in Chapter 1, Introduction and Shared Project Resources. If not, then you should know that the code in this chapter is specifically built with the setup from Chapter 1, Introduction and Shared Project Resources, in mind. However, it's not the end of the world—the code can easily be applied to other situations.

Firstly, we'll build the database. Copy out the following MySQL code into your database:

CREATE DATABASE `urls`;
USE `urls`;

CREATE TABLE `urls` (
  `url_id` int(11) NOT NULL AUTO_INCREMENT,
  `url_code` varchar(10) NOT NULL,
  `url_address` text NOT NULL,
  `url_created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`url_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

Tip

You don't have to call the database urls if you don't want to. Feel free to rename to something else if you wish; just be sure to update the config/database.php file accordingly.

Let's take...

Adjusting the routes.php file

We want short URLs—in fact the shorter the better. The user clicking on a URL would be better served if the URL were as short as possible; for that reason, it would be a good idea if we removed certain things from the URL to make it shorter—for example, the controller name and function name. We will use CodeIgniter's routing functionality to achieve this. This can be done as follows:

  1. Open the config/routes.php file for editing and find the following lines (near the bottom of the file):

    $route['default_controller'] = "welcome";
$route['404_override'] = '';

  2. Firstly, we need to change the default controller. Initially, in a CodeIgniter application, the default controller is set to welcome. However, we don't need that; instead we want the default controller to be create. So, consider the following line:

    $route['default_controller'] = "welcome";

    Replace it with the following code:

    $route['default_controller'] = "create";

  3. We will also need to set up a route rule for the...

Creating the model

The Urls_model contains three functions; obviously it contains our __construct() function but we're not focusing on that at the moment as it's not doing anything except referencing its parent.

Instead, let's look at the two functions save_url() and fetch_url(). As their names suggest, one saves information to the database and the other fetches information from it. For now, let's go and create the code and we'll discuss in detail what each function does later:
Create the urls_model.php model file and add the following code to it:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Urls_model extends CI_Model {
  function __construct() {
    parent::__construct();
  }

  function save_url($data) {
    /*
    Let's see if the unique code already exists in 
    the database.  If it does exist then make a new 
    one and we'll check if that exists too.  
    Keep making new ones until it's unique.  
    When we make one that's unique, use it...
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Description

If you are a PHP programmer or developer looking for a framework to quickly develop your applications, this book is for you. The prerequisites needed would be prior experience with CodeIgniter.

What you will learn

  • Create a base application to form the building blocks to develop your own web applications
  • Develop a user authorization system to enable user access and permit the resetting of passwords
  • Build an application to upload photos along with their descriptions
  • Develop a URL shortener to create a new URL and save it to the database
  • Design a job board to create and list new jobs and also register users and agents
  • Construct an application to assign time against task, by adding filters and graphics to data
  • Expand an ecommerce website to provide online shopping facility to users
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 21, 2015
Length: 330 pages
Edition : 1st
Language : English
ISBN-13 : 9781783287093
Category :
Web Development
Languages :
Python
Concepts :
Server Side Web Development

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Estimated delivery fee Deliver to United States

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Product Details

Publication date : Jan 21, 2015
Length: 330 pages
Edition : 1st
Language : English
ISBN-13 : 9781783287093
Category :
Web Development
Languages :
Python
Concepts :
Server Side Web Development

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Table of Contents

10 Chapters
1. Introduction and Shared Project Resources Chevron down icon Chevron up icon
1. Introduction and Shared Project Resources
Common resources
Downloading CodeIgniter
Installing Twitter Bootstrap
Removing index.php from the address bar
Installing and using Sparks
Creating a shared header and footer view
Common language items
Creating the MY_Controller file
Autoloading common system resources
Security considerations
Summary
2. A URL Shortener Chevron down icon Chevron up icon
2. A URL Shortener
Design and wireframes
Creating the database
Adjusting the routes.php file
Creating the model
Creating views
Creating controllers
Creating the language file
Putting it all together
Summary
3. Discussion Forum Chevron down icon Chevron up icon
3. Discussion Forum
Design and wireframes
Creating the database
Adjusting the config.php file
Adjusting the routes.php file
Creating the models
Creating views
Creating the controllers
Creating the language file
Putting it all together
Summary
4. Creating a Photo-sharing Application Chevron down icon Chevron up icon
4. Creating a Photo-sharing Application
Design and wireframes
Creating the database
Adjusting the config.php and autoload.php files
Adjusting the routes.php file
Creating the model
Creating the views
Creating the controllers
Creating the language file
Putting it all together
Summary
5. Creating a Newsletter Signup Chevron down icon Chevron up icon
5. Creating a Newsletter Signup
Introduction
Design and wireframes
Creating the database
Adjusting the routes.php file
Creating the model
Creating the views
Creating the controllers
Creating the language file
Putting it all together
Summary
6. Creating an Authentication System Chevron down icon Chevron up icon
6. Creating an Authentication System
Introduction
Design and wireframes
Creating the database
Adjusting the config.php file
Adjusting the routes.php file
Creating the models
Creating the views
Creating the controllers
Creating the language file
Putting it all together
Summary
7. Creating an E-Commerce Site Chevron down icon Chevron up icon
7. Creating an E-Commerce Site
Introduction
Design and wireframes
Creating the database
Adjusting the config.php file
Adjusting the routes.php file
Creating the model
Creating the views
Creating the controllers
Creating the language file
Putting it all together
Summary
8. Creating a To-do List Chevron down icon Chevron up icon
8. Creating a To-do List
Introduction
Design and wireframes
Creating the database
Adjusting the config.php file
Adjusting the routes.php file
Creating the model
Creating views
Creating the controller
Creating the language file
Putting it all together
Summary
9. Creating a Job Board Chevron down icon Chevron up icon
9. Creating a Job Board
Introduction
Design and wireframes
Creating the database
Adjusting the config.php file
Adjusting the routes.php file
Creating the model
Creating views
Creating the controller
Creating the language file
Putting it all together
Summary
Index Chevron down icon Chevron up icon
Index

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eli otr Mar 16, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I was thrilled by reading this book. It covers much more than just codeigniter but good practice of PHP OOP programming , naming conventions.I addition it provide a lot of useful and advanced approach using latest Codeigniter Plugins such as the Sparks, integration with client side CSS/Javascript of the Bootstrap framework, and more.More then that it provides vast of good and practical examples of using the Codeigniter platform with various plugins in a very clear manner and bright explanations. I wish there were more books like this one.
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JT Dec 25, 2016
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Got this book for my son and he is enjoying it and putting the contents to good use.
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Kaley36 Aug 10, 2016
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Great book. A nice and easy way to get started.
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kumquat Dec 18, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Gute Projekt-Beispiele, die sich mit ein wenig Recherche auch auf Version 3.x übertragen lassen. Kann ich zum Einstieg empfehlen. Codebeispiele gibt es auch zum Download.
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Amazon Customer Jun 20, 2016
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I love this book so much but it waste for me to purchase book with not good quality papers. even though I love Amazon for good services that response on supports.
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About the author

Profile icon Robert Foster
Robert Foster
Rob Foster has been working in the field of web development for almost 10 years, working for various IT sectors. He has interests in CodeIgniter, Laravel, and iOS programming. While not hunched over a computer ruining his eyesight, he enjoys drinking good quality wine, appreciates varieties of fine cheese, and has a liking for a pair of comfortable, elastic slacks! Rob has also written CodeIgniter 2 Cookbook, Packt Publishing, and was a technical editor for SUSE Linux 10 Bible, Wiley.
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Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
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