CodeIgniter Interview Questions CodeIgniter is an open-source PHP framework popularly used for creating dynamic web applications.

With its CodeIgniter interview questions and answers intuitive yet straightforward design and development framework capabilities, CodeIgniter has quickly become one of the go-to frameworks among developers worldwide.

It provides simple yet robust tools for building online apps – an attractive feature among many.

Owing to its extensive features and functions, novice and veteran developers need a firm grasp of CodeIgniter.

That is why our blog has assembled frequently requested interview questions on this framework to assist you in preparing for an interview in CodeIgniter.

Now is the time to dive deep and learn more about this robust PHP framework!

1. What is CodeIgniter?

CodeIgniter is a popular web framework for PHP developers, offering an easy-to-understand toolkit for beginners.

2. Who created CodeIgniter?

Elis Lap created CodeIgniter.

3. Who is the target audience for CodeIgniter?

CodeIgniter’s target audience is PHP developers who want to learn to develop applications on the MVC platform.

4. What are the prerequisites for starting with CodeIgniter?

ABCDs (Abbreviations, Contents, and Defines) and am familiar with the MVC platform.

5. What skills are needed to use CodeIgniter?

Familiarity with HTML, PHP, and advanced PHP.

6. What does the user do after downloading the zip file?

The user extracts the zip file into a new folder called “CodeIgniter or project,” which contains all the contents of the subfolders.

7. How does CodeIgniter help PHP developers?

CodeIgniter has a red set of helpers that make it easier to use components when needed, saving time and reducing the time required to create the necessary components.

8. What security features does CodeIgniter offer?

CodeIgniter offers secure building, prevents attacks, provides security modules, helps with password protection, and contains cross-site scripting.

9. What are some key features of CodeIgniter?

CodeIgniter offers model view controller paths, full feed turns database classes, session management, cookie management, FTP class, localisation support, pagination support, data encryption benchmarking, full page caching, error logging system, application profiling system, and user agent class.

10. How do you install CodeIgniter?

Developers should establish the typical environmental setup with Vamp or Lamp/Map software stacks.

Local rules are then created using the Vamps server.

11. What is the PHP version required for CodeIgniter?

The PHP version required for CodeIgniter is more significant than 5.5, which makes it more portable.

12. What stands the PHP Admin CodeIgniter?

PHP Admin is a database system configuring databases for the CodeIgniter framework.

13. What is CodeIgniter, and why is it an ideal choice for web developers?

CodeIgniter is a lightweight framework offering various features for web developers to create and enhance their applications.

It’s ideal due to its lightweight design, support for multiple platforms, and easy installation.

14. What remains the latest version of CodeIgniter mentioned?

The latest version of CodeIgniter mentioned is 3.1.6.

15. Explain the advice for users if their version does not support 3.6 or more than 3x.

They should consider using the upcoming version, CodeIgniter 4, which is considered beta and not ready for production use.

16. How long does downloading the CodeIgniter Three zip file take?

Downloading the zip file takes around 2.6 seconds, but it could be faster with better internet.

17. What are the different versions of CodeIgniter?

The different versions mentioned are CodeIgniter 3x (current version), CodeIgniter 4 (beta version), and CodeIgniter 2 (legacy version).

18. What is the purpose of examining the code structure in CodeIgniter?

Examining the code structure in CodeIgniter allows developers to understand the organisation of various components, such as application systems, cache, config, controller, school, helpers, and hooks.

19. What stays the role of the cache folder in the web application?

The cache folder contains pages that increase the web application’s overall page access speed.

20. What type of files are stored in the config folder?

The config folder contains various files to configure the web application, including parameters like base URL and other basic configurations.

It also contains different database configuration settings, such as hostname, username, password, and database connection.

21. Explain the significance of CodeIgniter in web application development.

CodeIgniter is a powerful tool for creating web applications, especially for beginners.

It provides a comprehensive guide to CodeIgniter, covering the application system, documentation, and various configurations for web applications.

22. What is the role of the controller in the web application?

The controller is a crucial part of the application, including all the controllers that will be included in the web application.

23. What are helpers in CodeIgniter, and why are they essential?

Helpers are essential for creating beneficial applications. They provide functions for each page without writing them from scratch.

24. How are the hooks in CodeIgniter?

Hooks allow users to modify the framework’s user workings without hacking into the code files.

25. What is the role of the language folder in CodeIgniter?

The language folder includes various language-related files.

26. What type of files are stored in the model’s folder in CodeIgniter?

Models are database logins, which include related files and PHP extensions.

27. What stands the determination of the third-party folder in CodeIgniter?

The third-party folder contains plugins used for the application.

28. What is stored in the views folder in CodeIgniter?

The views folder stores all HTML files, similar to the V of the MVC application.

29. What are the essential files included in the structure of CodeIgniter?

The essential files include HTX for server configuration and HTX for project initialisation.

These files are necessary for maintaining lines and initialising the project.

30. What is the role of the application project in CodeIgniter?

The application project in CodeIgniter is divided into several subfolders, including the system, database, fonts, helpers, language, and user guide.

31. Can you Explain the significance of the core folder in CodeIgniter?

The core folder contains a core class that should not be modified while working on the application.

32. What are the contents of the database folder in CodeIgniter?

The database folder contains various databases, drivers, and utilities.

33. What fonts remain in CodeIgniter, and what is their purpose?

Fonts include font-related information and utilities.

34. What are helpers in CodeIgniter, and what is their role?

Helpers are standard CodeIgniter helpers.

35. What is the role of the language folder in CodeIgniter?

Language consists of any language-related files associated with it.

36. What is the purpose of the user guide in CodeIgniter?

The user guide is an offline version of the CodeIgniter framework that provides documentation-related files for developers.

37. What is the process of initialising an application in CodeIgniter?

The user starts with an HTX file and accesses application folders.

The application architecture is well-defined for each framework, beginning with five steps.

38. What are the five steps involved in the application architecture of CodeIgniter?

The steps include verifying the requested page, checking caching mode, performing a security check, loading necessary models, plugins, and scripts, rendering the view, and fetching the response.

39. How does the application controller interact in CodeIgniter?

The application controller interacts with the models and third parties, increasing functionality with plugins and scripts.

40. What stands the significance of understanding the application architecture of CodeIgniter?

Understanding the application architecture of CodeIgniter helps developers better manage their projects and ensure smoother application development.

41. What is the Model View Controller (MVC) agenda, and its purpose?

The Model View Controller (MVC) framework separates application logic from presentation, allowing web pages to contain minimal scripting since the presentation is separate from the PHP script.

It consists of three main components: model, view, and controller.

42. What remains the MVC framework of CodeIgniter with the model?

The model represents data structures and helps fetch the method of all queries.

These queries can be retrieved, inserted, and updated in the MVC data.

43. What is the role of the controller in the MVC outline of CodeIgniter?

A controller is an intermediary between the model, view, and any other resources related to the web application.

It fetches the response from both the view and the model according to the request.

44. How does the browser interact with CodeIgniter’s controller and other components?

The browser interacts with the controller, which, according to the request, interacts with the view and model.

It interacts with the model if it relates to something in the database.

If it is only with the interaction of static pages, view and controller coordinate with each other.

45. What remainsto resolve in exploring the public function index in CodeIgniter?

Exploring the public function index in CodeIgniter allows you to load a particular view and check whether the controller obtains the desired output using the “echo” command.

46. How does the MVC framework help in understanding CodeIgniter?

Understanding the basic concepts of coding data, controller design, and view design helps better understand the functionality of the CodeIgniter project.

47. What is the role of the controller in CodeIgniter?

The controller is the first thing loaded, and data from the model is loaded and rendered.

48. What is the purpose of the “my index” function in CodeIgniter?

The “my index” function is called by default when the controller is called.

To access the method, copy its name and place it in place of the index.

49. What happens if CodeIgniter’s default function (index) is deleted?

If the default function (index) is deleted, the view will be updated, and the solution code will generate the page dynamically.

50. How can we edit the front view using CodeIgniter?

We can edit the front view using CodeIgniter by deleting the default function and writing a custom method.

51. What happens if there is no index function in CodeIgniter?

If there is no index function, it will give a 404 error.

52. How can the 404 error due to the absence of the index function be resolved in CodeIgniter?

Uncommenting the default function and writing a custom method can resolve this issue.

53. How is a custom view created in a controller?

A custom view is created by creating a new PHP file in the views folder, e.g., “my index view dot PHP.”

54. How is a custom controller created in CodeIgniter?

A custom controller is created by creating a new PHP file in the controller’s folder, following the naming convention “my controller dot PHP.”

55. What is the default controller’s method in CodeIgniter?

The default controller’s method is to echo “This is my controller.”

56. How does the custom controller flow work with the base URL?

The custom controller flow is the same as the base URL, which is the name of the default controller.

57. How is the view of the custom controller loaded?

The view of the custom controller is loaded by creating a load view with a specific name in the “my controller” folder.

58. How is a test function loaded from the custom controller?

A test function is loaded from the custom controller by echoing “This is the test function from my controller” and using the format “index dot PHP slash my controller.” CodeIgniterinterview machine test.

59. What elements are involved in the MVC pattern?

The M V C pattern involves a web browser, controller, model, database connectivity, APIs, and data formats like XML, text files, and images.

60. What remain the critical features of Code NIDR?

Code NIDR is free, open-source, and lightweight. It generates clean URLs, is essential for SEO and has helpful documentation for learning PHI.

61. What are some built-in features of CodeIgniter?

CodeIgniter includes features like benchmarking, caching drivers, calendaring, shopping cart, email, encryption, file uploading, form validation, and image manipulation classes.

62. How is the form validation class used in CodeIgniter?

To use the form validation class, you must load the library first and specify its name.

The form validation method is found in the documentation, and you can use techniques like set rules.

63. What other modules are used in CodeIgniter projects?

Other used classes include image uploading, image manipulation, and pagination.

These will be taught individually in the upcoming semester.

64. How does the data flow in the MVC pattern?

The web browser requests the controller, which retrieves data from the model.

The model fetches data from the database or APIs and creates a view for the browser.

65. What is the protagonist of the view in the MVC?

Views represent information that is presented to a user.

In Code Igniter, views can be web pages, headers, footers, RSS pages, or output pages.

CodeIgniter is a versatile PHP framework used extensively in web development. PHP CodeIgniter interview questions and answers.

Utilising its Model View Controller architectural pattern, it provides an organised approach to application creation suited to newcomers and experienced programmers.

This blog covered various CodeIgniter interview questions, from routing, views, and controllers to database administration security performance issues.

Here are CodeIgniter interview questions and answers for experienced candidates and CodeIgniter interview questions and answers for freshers, too.

It is wise to familiarise yourself with the interview framework before attending one, as this will significantly increase your odds of success.

I hope our blog has been helpful, and I wish you every success with any upcoming CodeIgniter interviews!

Good Luck !!! Thank You!!!