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

Codeigniter

Ques:- How to enable error logging in codeigniter?

Asked In :-

Right Answer:
To enable error logging in CodeIgniter, open the `application/config/config.php` file and set the following configuration:

```php
$config['log_threshold'] = 1; // Set to 1 or higher to enable logging
```

You can also specify the log file path in `application/config/config.php`:

```php
$config['log_path'] = ''; // Leave empty to use default path
```

Make sure the `application/logs` directory is writable.

Codeigniter

Ques:- Explain url helper?

Asked In :-

Right Answer:
The URL helper in CodeIgniter provides functions to assist with URL creation and manipulation, such as generating site URLs, creating query strings, and managing URL segments. It simplifies tasks like building links and redirecting users within the application.

Codeigniter

Ques:- Why we use cli in codeigniter?

Asked In :-

Right Answer:
We use CLI (Command Line Interface) in CodeIgniter to run tasks and scripts directly from the command line, allowing for automated processes, background jobs, and easier management of tasks like database migrations, seeding, and running cron jobs without needing a web interface.

Codeigniter

Ques:- Can you list some commonly used url helpers in codeigniter?

Asked In :-

Right Answer:
Some commonly used URL helpers in CodeIgniter are:

1. `site_url()`
2. `base_url()`
3. `current_url()`
4. `uri_string()`
5. `redirect()`
6. `anchor()`

Codeigniter

Ques:- In which directory logs are saved in codeigniter?

Asked In :-

Right Answer:
Logs are saved in the `application/logs` directory in CodeIgniter.

Codeigniter

Ques:- How to set csrf token in codeigniter?

Asked In :-

Right Answer:
To set the CSRF token in CodeIgniter, ensure that CSRF protection is enabled in the `application/config/config.php` file by setting:

```php
$config['csrf_protection'] = TRUE;
```

Then, in your forms, include the CSRF token using:

```php
<input type="hidden" name="<?= $this->security->get_csrf_token_name(); ?>" value="<?= $this->security->get_csrf_hash(); ?>">
```

This will add the CSRF token as a hidden input field in your form.

Codeigniter

Ques:- What are sessions in codeigniter?

Asked In :-

Right Answer:
Sessions in CodeIgniter are a way to store user data across multiple pages. They allow you to maintain state and keep track of user information, such as login status or user preferences, during a user's visit to the application. CodeIgniter provides a built-in session library that simplifies session management.

Codeigniter

Ques:- Explain codeigniter architecture?

Asked In :-

Right Answer:
CodeIgniter follows the Model-View-Controller (MVC) architecture.

- **Model**: Manages data and business logic. It interacts with the database and retrieves or stores data.
- **View**: Represents the user interface. It displays data to the user and sends user input to the controller.
- **Controller**: Acts as an intermediary between the Model and View. It processes user requests, interacts with the Model, and loads the appropriate View.

This separation of concerns allows for better organization, scalability, and maintainability of the application.

Codeigniter

Ques:- How can you load a view in codeigniter?

Asked In :-

Right Answer:
You can load a view in CodeIgniter using the following code:

```php
$this->load->view('view_name');
```

Codeigniter

Ques:- How can you add or load a model in codeigniter?

Asked In :-

Right Answer:
You can add or load a model in CodeIgniter using the following code in your controller:

```php
$this->load->model('ModelName');
```

Replace `ModelName` with the name of your model file (without the `.php` extension).

Codeigniter

Ques:- Explain controller in codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, a controller is a class that handles user requests, processes input, interacts with models, and loads views to display the output. It acts as an intermediary between the model and the view, managing the application flow and logic.

Codeigniter

Ques:- How do you use aliases with autoloading models in codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, you can use aliases with autoloading models by defining the model in the `config/autoload.php` file. For example, if you want to alias a model called `User_model` as `User`, you can do the following:

1. In `application/config/autoload.php`, add your model to the `$autoload['model']` array:
```php
$autoload['model'] = array('User_model' => 'User');
```

2. Now, you can use the alias `User` in your controllers or other models:
```php
$this->User->some_method();
```

Codeigniter

Ques:- Explain codeigniter library. How will you load it?

Asked In :-

Right Answer:
In CodeIgniter, a library is a collection of pre-built functions that can be used to perform specific tasks, such as handling sessions, sending emails, or working with databases. To load a library, you can use the following code in your controller:

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

Replace `library_name` with the name of the library you want to load.

Codeigniter

Ques:- How you will work with error handling in codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, you can handle errors by using the built-in logging system. You can set the logging threshold in the `application/config/config.php` file by adjusting the `$config['log_threshold']` value. Additionally, you can create custom error handlers by extending the `CI_Controller` class and using the `show_error()` function to display user-friendly error messages. For database errors, you can check for errors using `$this->db->error()` after database operations.

Codeigniter

Ques:- Explain mvc in codeigniter?

Asked In :-

Right Answer:
MVC in CodeIgniter stands for Model-View-Controller.

- **Model**: Manages data and business logic. It interacts with the database and retrieves or stores data.
- **View**: Represents the user interface. It displays data to the user and sends user input to the controller.
- **Controller**: Acts as an intermediary between Model and View. It processes user requests, interacts with the model to fetch data, and loads the appropriate view to display the data.

Codeigniter

Ques:- In which language codeigniter is written?

Asked In :-

Right Answer:
CodeIgniter is written in PHP.

Codeigniter

Ques:- What are the most prominent features of codeigniter?

Asked In :- briskminds software solutions pvt. ltd.,

Right Answer:
The most prominent features of CodeIgniter are:

1. **Lightweight**: Minimal footprint and fast performance.
2. **MVC Architecture**: Follows the Model-View-Controller design pattern.
3. **Easy to Learn**: Simple and straightforward syntax.
4. **Built-in Libraries**: Offers a variety of libraries for common tasks.
5. **Security Features**: Includes protection against CSRF and XSS attacks.
6. **Database Support**: Supports multiple databases and has an active record class.
7. **URL Routing**: Flexible routing options for clean URLs.
8. **Extensible**: Easy to extend with custom libraries and helpers.
9. **Community Support**: Strong community and extensive documentation.

Codeigniter Core PHP Css3 HTML Javascript Jquery MySQL

Ques:- Its final interview for hire?

Asked In :- Muvi Entertainment, Infiniti Software Solutions, SPB, Young Globes, Payoda, TechMojo Solutions, Invenger Technologies, 3clogic, Utthunga, MAXVY,

Right Answer:
It seems like the question is incomplete or unclear. Please provide more context or clarify the question for a proper answer.

Codeigniter

Ques:- How can you remove index.php from URL in Codeigniter?

Asked In :-

Right Answer:
To remove `index.php` from the URL in CodeIgniter, follow these steps:

1. Open the `config.php` file located in `application/config/`.
2. Set the `index_page` variable to an empty string:
```php
$config['index_page'] = '';
```

3. Create or edit the `.htaccess` file in the root directory of your CodeIgniter installation with the following content:
```apache
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]
```

4. Ensure that the Apache `mod_rewrite` module is enabled.

After completing these steps, `index.php` will be removed from the URL.

Comments

DK BOSS Jul 30, 2021

Step:-1 Open the folder “application/config” and open the file “config.php“. find and replace the below code in config.php file.

//find the below code
$config['index_page'] = "index.php"
//replace with the below code
$config['index_page'] = ""
Step:-2 Go to your CodeIgniter folder and create .htaccess

Path:
Your_website_folder/
application/
assets/
system/
.htaccess <——— this file
index.php
Step:-3 Write below code in .htaccess file

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

Step:-4 In some case the default setting for uri_protocol does not work properly. To solve this problem just open the file “application/config/config.php“, then find and replace the below code

//Not needed for CodeIgniter 3 its already there.
//find the below code
$config['uri_protocol'] = "AUTO"
//replace with the below code
$config['uri_protocol'] = "REQUEST_URI"
Thats all but in wamp server it does not work because rewrite_module by default disabled so we have need to enable it. for this do the following

Left click WAMP icon
Apache
Apache Modules
Left click rewrite_module

Codeigniter

Ques:- What is inhibitor are Codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, an "inhibitor" is not a standard term. However, if you meant "inhibitor" in the context of preventing certain actions or behaviors, it typically refers to mechanisms like hooks or middleware that can intercept requests and responses to modify or restrict functionality.

Comments

DK BOSS Jul 30, 2021

Inhibitor in Codeigniter is a class in Codeigniter which internally uses native error handling functions of PHP like set_error_handler,get_exception_handler, register_shutdown_function to handle parse errors, exceptions, and fatal 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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