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

Codeigniter

Ques:- How to delete a record in Codeigniter?

Asked In :-

Right Answer:
To delete a record in CodeIgniter, you can use the `delete()` method of the model. Here’s an example:

```php
$this->db->where('id', $record_id);
$this->db->delete('table_name');
```

Replace `table_name` with your actual table name and `$record_id` with the ID of the record you want to delete.

Codeigniter

Ques:- How to set or get config variables in Codeigniter?

Asked In :-

Right Answer:
To set a config variable in CodeIgniter, use:

```php
$this->config->set_item('key', 'value');
```

To get a config variable, use:

```php
$value = $this->config->item('key');
```

Codeigniter

Ques:- Explain CodeIgniter’s application flow chart.

Asked In :-

Right Answer:

CodeIgniter’s application flow chart consists of the following steps:

1. **Index.php**: The entry point of the application.
2. **System Folder**: Loads the core framework files.
3. **Config Files**: Loads configuration settings (database, routes, etc.).
4. **Routing**: The router determines which controller and method to call based on the URL.
5. **Controller**: The selected controller processes the request.
6. **Model**: If needed, the controller interacts with the model to retrieve or manipulate data.
7. **View**: The controller loads the appropriate view to display the output.
8. **Output**: The final output is sent to the browser.

This flow ensures a structured approach to handling requests and responses in a CodeIgniter application.

Codeigniter

Ques:- What is_cli() method does in Codeigniter?

Asked In :-

Right Answer:
The `is_cli()` method in CodeIgniter checks if the script is being run from the command line interface (CLI) rather than through a web server. It returns `TRUE` if the script is executed via CLI, and `FALSE` otherwise.

Codeigniter

Ques:- How to check a field or column exists in a table or not in Codeigniter?

Asked In :-

Right Answer:
You can check if a field or column exists in a table in CodeIgniter using the following method:

```php
$this->db->query("SHOW COLUMNS FROM your_table_name LIKE 'your_column_name'");
if ($this->db->affected_rows() > 0) {
// Column exists
} else {
// Column does not exist
}
```

Codeigniter

Ques:- How to do 301 redirects in CodeIgniter?

Asked In :-

Right Answer:
To perform a 301 redirect in CodeIgniter, you can use the `redirect()` function in your controller. Here’s an example:

```php
public function your_method() {
redirect('new-url', 'location', 301);
}
```

Replace `'new-url'` with the URL you want to redirect to.

Codeigniter

Ques:- What is the CLI? Why we use CLI in Codeigniter?

Asked In :-

Right Answer:
CLI stands for Command Line Interface. In CodeIgniter, we use CLI to run scripts and perform tasks directly from the command line, such as running migrations, generating controllers, or executing scheduled tasks, which can enhance development efficiency and automate processes.

Codeigniter

Ques:- How you will use or load CodeIgniter libraries

Asked In :-

Right Answer:
In CodeIgniter, you can load libraries using the `$this->load->library('library_name');` method within your controller. For example, to load the session library, you would use `$this->load->library('session');`.

Codeigniter

Ques:- How to get last inserted id in CodeIgniter?

Asked In :-

Right Answer:
You can get the last inserted ID in CodeIgniter using the following code after an insert operation:

```php
$last_id = $this->db->insert_id();
```

Codeigniter

Ques:- What are Sessions In CodeIgniter? How to read, write or remove session in CodeIgniter?

Asked In :-

Right Answer:
Sessions in CodeIgniter are used to store user data across multiple pages.

To **write a session**:
```php
$this->session->set_userdata('key', 'value');
```

To **read a session**:
```php
$value = $this->session->userdata('key');
```

To **remove a session**:
```php
$this->session->unset_userdata('key');
```

To **destroy all sessions**:
```php
$this->session->sess_destroy();
```

Codeigniter

Ques:- How will you add or load a model in Codeigniter?

Asked In :-

Right Answer:
In CodeIgniter, you can load a model using the following code in your controller:

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

Replace `ModelName` with the actual name of your model.

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.

Questions in: Codeigniter

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