CodeIgniter 4 How To Read Parse CSV File Tutorial

Reading Time: 4 minutes

CSV (Comma-Separated Values) files serve as a widely used format for storing tabular data, and handling them within web applications is a common requirement. In CodeIgniter 4, parsing CSV files allows developers to extract, process, and manipulate tabular data seamlessly.

In this tutorial, we’ll see the comprehensive process of reading and parsing CSV files using CodeIgniter 4. This functionality empowers developers to efficiently handle tabular data stored in CSV format within their applications.

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Let’s get started.

CodeIgniter 4 Installation

To create a CodeIgniter 4 setup run this given command into your shell or terminal. Please make sure composer should be installed.

composer create-project codeigniter4/appstarter codeigniter-4

Assuming you have successfully installed application into your local system.

Environment (.env) Setup

When we install CodeIgniter 4, we will have env file at root. To use the environment variables means using variables at global scope we need to do env to .env

Either we can do via renaming file as simple as that. Also we can do by terminal command.

Open project in terminal

cp env .env

Above command will create a copy of env file to .env file. Now we are ready to use environment variables.

Enable Development Mode

CodeIgniter starts up in production mode by default. You need to make it in development mode to see any error if you are working with application.

Open .env file from root.

# CI_ENVIRONMENT = production

 // Do it to 
CI_ENVIRONMENT = development

Now application is in development mode.

CSV Data Preparation

Let’s consider a .csv file in application. We have a students.csv inside /writable folder.

If we open that file, it is looking like this –

Sanjay Kumar,,Male
Ashish Kumar,,Male
Vijay Rohila,,Male
Dhananjay Negi,,Male
Monu Thakur,,Female

You can place this .csv file either in /writable folder or /public folder.

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Create Controller

Assuming .csv file is stored inside /writable folder.

Open project into terminal and run this spark command.

php spark make:controller Site --suffix

It will create a file SiteController.php inside /app/Controllers folder.

Open file and write this complete code into it.


namespace App\Controllers;

use App\Controllers\BaseController;

class SiteController extends BaseController
    public function index()
        $students = [];

        if (($open = fopen(WRITEPATH . "students.csv", "r")) !== FALSE) {

            while (($data = fgetcsv($open, 1000, ",")) !== FALSE) {
                $students[] = $data;


        echo "<pre>";


if (($open = fopen(WRITEPATH . "students.csv", "r")) !== FALSE) {

    while (($data = fgetcsv($open, 1000, ",")) !== FALSE) {
        $students[] = $data;


Here, we are parsing students.csv file. WRITEPATH is a CodeIgniter 4 constant which returns the path upto /writable folder.

If you have taken /public folder then you should use FCPATH in place of it.

Once you get data from .csv into array format, you can insert into your database as well.

Create Route

Open Routes.php from /app/Config folder. Add this route into it.


$routes->get('/data', 'SiteController::index');


Application Testing

Open project terminal and start development server via command:

php spark serve

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URL: http://localhost:8080/data

That’s it.

We hope this article helped you to learn about How To Read Parse CSV File in CodeIgniter 4 Tutorial in a very detailed way.

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Sanjay KumarHello friends, I am Sanjay Kumar a Web Developer by profession. Additionally I'm also a Blogger, Youtuber by Passion. I founded Online Web Tutor and Skillshike platforms. By using these platforms I am sharing the valuable knowledge of Programming, Tips and Tricks, Programming Standards and more what I have with you all. Read more