Seeing that some people come here on nairaland to ask or compare php to other programming languages or find it difficult in coding with php. I have decided to put up a tutorial to show you an easier way of coding in php. You don't have to spend hours coding. CI can help reduce the workload.
Note:this is my first time doing this kind of stuff. Make una help me with una comments and constructive criticism. Oya, lets go!

Introduction

What is codeIgniter?
CodeIgniter(ci) is a php framework. A framework simply means an assemblage of functions. To cut the long story short, a framework will help you code faster, cleaner and reusable code. For example, imagine that you want to create a form validation process. You will have to go through the tedious process of creating the form. Then probably creating another file to handle the validation. For those knowledgeable in oop style. You will then create a class and object for it. Imagine all this long journey for simple validation. You just set the form like this.
php echo validation_errors(); ?>
<?php echo form_open('welcome/mail') ?>
Name: <?php echo form_input('name', set_value('name')); ?> <br/> Phone: <?php echo form_input('phone', set_value('phone')); ?> <br/> Message: <?php echo form_textarea('message', set_value('message')
And touch 1 or 2 in the controller and you are all set. CI already has what it calls "helpers and libraries" to help you out. All you have to do is call the function you want to use. Don't worry if do not understand all i am saying now, it all become clearer as the tutorial progresses.
CodeIgniter follows the MVC pattern(will explain this later) of development. It is also object oriented.

What you need for this tutorial.
1.you must have basic knowledge of php and mysql
2.html
3.get a server. Preferably xampp for windows users
4.download codeigniter. Its lightweight, so you cry about mb. Its just about 2mb or so. Will teach how to install and configure later.
Note: they are other php frameworks out there. Like cakePhp, laravel, zend framework etc. They all have their pro and cons. So just google them to get more info.

Introduction to codeIgniter


https://www.youtube.com/watch?v=k2gb8OVoAB0

Installation
First you need to have a hosted server(e.g xampp).
After you have hosted your server go to the codeIgniter website at [url]http://codeigniter.com [/url]. Click on the download button on the homepage to download it.

after you have downloaded CodeIgniter, Unzip the folder, and install the CodeIgniter files in your website's or server root folder. If you
are using XAMPP, this is usually the HT docs folder within the Xampp folder.
For WAMP it is WWW inside the Wamp folder.

Once you have moved the CI files, have a look at the new directories that have been
created. Understanding what different type of files and folders do is critical.
The initial files and folders we can see are:
• system folder
• Application folder
• user_guide folder
• index.php file
Composer.php
• license.txt
We are only going to focus on the system and application folder and index.php file in this tutorial

move the application folder into the system folder.

These are our main site's files and folders, the index.php file being the most important one, it will act as the main controller and will route application requests to
the required controllers. Without this file, CodeIgniter can't work.

Next in importance is the system folder. The framework's base files and libraries
are present in this folder. We, as programmers, won't need to modify those files for
our normal usage. However, it's important to know what those files are and what
they do.

The most important folder, the one that deserves most of your attention, is the system/application
folder and all of its sub folders. Ninety - nine percent of your work will be done right in this folder, so it
deserves a bit of attention at this point. Learning "what goes where" now, will reduce confusion later

Installation of codeIgniter

https://www.youtube.com/watch?v=21F9NHNRuQE

Please continue you're doing great job

Ride on bro.I am enjoying It

configurations

I want you to first rename the CodeIgniter folder.
To CI or any other name of your choice.

Now that we have renamed our codeIgniter base file and taken a look at our CI files and structure, we are going to check if it's working.
An easy way to see if your site is working is to navigate to it using your browser.
Http://Localhost/ci
It will bring out the welcome page. Then you will know its working. Next will be the configurations proper

I am with you brother ride on

the first file we are going to look at is the Config.ph file. Locate it at the system/application/config.php
The config.php file contains a series of configuration options that CodeIgniter uses to keep track of your application's information and settings.
The first configuration option you need to set inside config.php is the base URL of your application.
You do that by setting the absolute URL for $config['base_url'] ,
like so:
$config['base_url'] = “http://localhost/ci/”;

Once you've set this configuration option, you can recall it whenever you want using the CodeIgniter base_url() function, which can be a very handy thing to know. This one feature keeps you from
having to rewrite hard coded URLs in your application, when you migrate from development to test or
from test to production.

The second thing you need to do is set a value for your home page by editing the $config['index_page'] configuration option. CodeIgniter ships with a value of "index.php" for this option, which
means that index.php will appear in all of your URLs. Many CodeIgniter developers prefer to keep this
value blank, like so:
$config['index_page'] = '';

Change $config['url_protocol']; to
AUTO

Watch the configuration video



https://www.youtube.com/watch?v=6QIP6qKVwnw

How do i contact you?

JASKID:
How do i contact you?

You can message me through my email.
Obilouis@gmail.com