Codeigniter Interview Questions and Answers in 2025 (100+ Q&A)

Codeigniter

Ques:- How do you set default timezone in Codeigniter ?

Asked In :-

Right Answer:
To set the default timezone in CodeIgniter, you can add the following line to the `index.php` file:

```php
date_default_timezone_set('Your/Timezone');
```

Replace `'Your/Timezone'` with the desired timezone, such as `'America/New_York'`.

Codeigniter

Ques:- List Common Functions in Codeigniter?

Asked In :-

Right Answer:
Common functions in CodeIgniter include:

1. **load->view()** - Load a view file.
2. **load->model()** - Load a model.
3. **input->post()** - Retrieve POST data.
4. **input->get()** - Retrieve GET data.
5. **form_validation->set_rules()** - Set validation rules for forms.
6. **session->set_userdata()** - Set session data.
7. **session->userdata()** - Get session data.
8. **redirect()** - Redirect to another page.
9. **db->get()** - Retrieve data from the database.
10. **db->insert()** - Insert data into the database.

Codeigniter

Ques:- What are hooks in CodeIgniter? List them?

Asked In :- Gritsa Technologies,

Right Answer:
Hooks in CodeIgniter are a way to extend the framework's functionality without modifying the core files. They allow you to execute custom code at specific points during the execution of the application.

The available hooks in CodeIgniter are:

1. pre_system
2. pre_controller
3. post_controller_constructor
4. post_controller
5. display_override
6. cache_override
7. post_system

Codeigniter

Ques:- Explain routing in CodeIgniter?

Asked In :-

Right Answer:
Routing in CodeIgniter is the process of mapping URL requests to specific controller functions. It allows developers to define how URLs are handled by the application, enabling the creation of user-friendly and SEO-friendly URLs. The routing configuration is typically done in the `application/config/routes.php` file, where you can set default routes, custom routes, and route parameters.

Codeigniter

Ques:- Explain helpers in CodeIgniter and how to load helper file?

Asked In :-

Right Answer:
Helpers in CodeIgniter are simple PHP functions that assist in performing common tasks, such as URL manipulation, form handling, and string operations. To load a helper file, you can use the `load->helper()` method in your controller. For example:

```php
$this->load->helper('url');
```

This will load the URL helper, allowing you to use its functions in your controller or view.

Codeigniter

Ques:- List some features provided by CodeIgniter?

Asked In :-

Right Answer:
1. Lightweight and fast performance
2. MVC (Model-View-Controller) architecture
3. Built-in security features (XSS filtering, CSRF protection)
4. Easy to configure and set up
5. Active Record Database pattern for database interactions
6. Extensive documentation and community support
7. Support for multiple database platforms
8. URL routing and SEO-friendly URLs
9. Built-in libraries and helpers for common tasks
10. Support for third-party libraries and integration

Codeigniter

Ques:- List Databases supported By Codeigniter Frameworks?

Asked In :-

Right Answer:
CodeIgniter supports the following databases:

1. MySQL
2. MySQLi
3. PostgreSQL
4. SQLite
5. Oracle
6. SQL Server

Codeigniter

Ques:- How to check the version of CodeIgniter framework?

Asked In :-

Right Answer:
To check the version of the CodeIgniter framework, open the `system/core/CodeIgniter.php` file and look for the line that defines the version, which typically looks like this:

```php
public $version = 'X.X.X';
```

Alternatively, you can also check the version by accessing the `system/core/CodeIgniter.php` file in your project and looking for the version number defined there.

Codeigniter

Ques:- What is the current version of Codeigniter?

Asked In :-

Right Answer:
The current version of CodeIgniter is 4.2.4.

Codeigniter

Ques:- Explain what is Codeigniter?

Asked In :-

Right Answer:
CodeIgniter is an open-source PHP framework used for developing web applications. It follows the Model-View-Controller (MVC) architectural pattern, providing a set of libraries and tools to help developers build applications quickly and efficiently with minimal configuration.

Codeigniter

Ques:- How many types of messages can you log in Codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, you can log four types of messages: **ERROR**, **DEBUG**, **INFO**, and **ALL**.

Codeigniter

Ques:- In which directory logs are saved in Codeigniter? How to enable error logging in Codeigniter?

Asked In :-

Right Answer:
Logs are saved in the `application/logs` directory in CodeIgniter. To enable error logging, set the `log_threshold` in the `application/config/config.php` file to a value greater than 0.

Codeigniter

Ques:- In which files routes are defined in Codeigniter?

Asked In :-

Right Answer:
Routes are defined in the `application/config/routes.php` file in CodeIgniter.

Codeigniter

Ques:- List the resources that can be autoloaded in Codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, the resources that can be autoloaded are:

1. Libraries
2. Helpers
3. Models
4. Config files
5. Language files
6. Hooks
7. Packages

Codeigniter

Ques:- Explain URL Helper? Can you list some commonly used URL helpers in Codeigniter?

Asked In :-

Right Answer:
The URL Helper in CodeIgniter provides functions to assist with URL creation and manipulation. Some commonly used URL helpers include:

1. `site_url()`: Generates a URL for a given path.
2. `base_url()`: Returns the base URL of the application.
3. `anchor()`: Creates an HTML anchor link.
4. `redirect()`: Redirects to a specified URL.
5. `uri_string()`: Returns the URI string of the current request.

Codeigniter

Ques:- What is an ORM? List ORMs for CodeIgniter.

Asked In :-

Right Answer:

ORM stands for Object-Relational Mapping, which is a programming technique used to convert data between incompatible type systems in object-oriented programming languages.

ORMs for CodeIgniter include:
1. Eloquent (from Laravel)
2. Doctrine
3. CodeIgniter's built-in Active Record class (though not a full ORM, it provides some ORM-like functionality)

Codeigniter

Ques:- Why CodeIgniter is called as loosely based MVC framework?

Asked In :- Mango IT Solutions,

Right Answer:
CodeIgniter is called a loosely based MVC framework because it allows developers to use the Model-View-Controller architecture without enforcing strict separation between the components, enabling more flexibility in how they structure their applications.

Codeigniter

Ques:- How to get random records in MySQL using CodeIgniter?

Asked In :-

Right Answer:
To get random records in MySQL using CodeIgniter, you can use the `order_by` method with the `RAND()` function in your query. Here’s an example:

```php
$this->db->order_by('RAND()');
$query = $this->db->get('your_table_name', $limit);
$result = $query->result();
```

Replace `'your_table_name'` with the name of your table and `$limit` with the number of random records you want to retrieve.

Codeigniter

Ques:- What is the default URL pattern used in Codeigniter framework?

Asked In :-

Right Answer:
The default URL pattern used in CodeIgniter is `http://example.com/index.php/controller/method/parameter`.

Codeigniter

Ques:- How to implement validations in Codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, you can implement validations using the Form Validation library. First, load the library in your controller:

```php
$this->load->library('form_validation');
```

Then, set validation rules using the `set_rules()` method:

```php
$this->form_validation->set_rules('field_name', 'Field Label', 'required|valid_email');
```

After setting the rules, check if the form validation passes:

```php
if ($this->form_validation->run() == FALSE) {
// Validation failed, load the form again with errors
} else {
// Validation succeeded, process the data
}
```

You can display validation errors in your view using:

```php
echo validation_errors();
```

The CodeIgniter category on takluu.com is tailored for web developers preparing for interviews and jobs requiring knowledge of the CodeIgniter PHP framework. Known for its lightweight and fast performance, CodeIgniter is widely used to build dynamic web applications with the Model-View-Controller (MVC) architecture.

This section covers important topics such as CodeIgniter installation, MVC framework basics, routing, controllers, models, views, database interaction, form validation, and session management. You’ll also find questions related to security features, error handling, libraries, and helpers that are critical in real-world applications.

Interviewers often test candidates on practical scenarios such as:

“How do you create and manage routes in CodeIgniter?”
“Explain the role of controllers and models.”
“How does CodeIgniter handle security and data validation?”

Our content simplifies complex framework concepts through clear explanations, code snippets, and example projects. Whether you are a fresher or an experienced developer, this category will help you strengthen your foundation and prepare effectively for technical rounds.

At Takluu, we keep the CodeIgniter content updated with the latest version features and best practices to ensure you stay ahead in your career and interview preparation.

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