1) Explain what is CodeIgniter?

Codeigniter is an open source framework for web application. It is used to develop 
websites on PHP. It is loosely based on MVC pattern, and it is easy to use compare
 to other PHP framework.

2) Explain what are hooks in CodeIgniter?

Codeigniter’s hooks feature provides a way to change the inner working of the 
framework without hacking the core files. In other word, hooks allow you to 
execute a script with a particular path within the Codeigniter.  Usually, it is
 defined in application/config/hooks.php file.

3) Explain how you will load or add a model in CodeIgniter?

Within your controller functions, models will typically be loaded; you will use the function
$this->load->model (‘Model_Name’);

4) Explain what helpers in CodeIgniter are and how you can load a helper file?

In CodeIgniter, helpers are group of function in a particular category that assist you
 to perform specific functions. In CodeIgniter, you will find many helpers like URL
 helpers- helping in creating links, Text helpers- perform various text formatting
 routines, Cookies- helpers set and read cookies.  You can load helper 
file by using command $this->load->helper (‘name’) ;

5) Explain routing in Codeigniter?

In CodeIgniter, the way PHP files served is different rather than accessing it directly
 from the browser. This process is called routing. Routing in CodeIgniter gives 
you freedom to customize the default URL pattern to use our own URL pattern 
according to the requirement. So, whenever there is a request made and matches 
our URL pattern it will automatically direct to the specified controller and  function.

6) Why is there a need to configure the URL routes?

Changing the URL routes has some benefits like
From SEO point of view, to make URL SEO friendly and get more user visits
Hide some URL element such as a function name, controller name, etc. from the 
users for security reasons
Provide different functionality to particular parts of a system

7) List out different types of hook point in Codeigniter?

Different types of hook point in Codeigniter includes

post_controller_constructor
pre_controller
post_sytem
pre_system
cache_override
display_override
post_controller
8) Mention what are the security parameter for XSS in CodeIgniter?

Codeigniter has got a cross-site scripting hack prevention filter. This filter either 
runs automatically or you can run it as per item basis, to filter all POST and 
COOKIE data that come across.  The XSS filter will target the commonly used
 methods to trigger JavaScript or other types of code that attempt to hijack 
cookies or other malicious activity. If it detects any suspicious thing or anything 
disallowed is encountered, it will convert the data to character entities.

9) Explain how you can link images/CSS/JavaScript from a view in code igniter?

In HTML, there is no Codeigniter way, as such it is a PHP server side framework.
 Just use an absolute path to your resources to link images/CSS/JavaScript 
from a view in CodeIgniter

/css/styles.css

/js/query.php

/img/news/566.gpg

10) Explain what is inhibitor in CodeIgniter?
For CodeIgniter, inhibitor is an error handler class, using the native PHP functions
 like set_exception_handler, set_error_handler, register_shutdown_function 
to handle parse errors, exceptions, and fatal errors.                    
                

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