CodeIgniter How To Create Environment Variables Example

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CodeIgniter 4 facilitates the use of environment variables to store and handle such sensitive or environment-specific configurations securely.

In this tutorial, we’ll see the process of creating and utilizing environment variables within CodeIgniter 4. This functionality empowers developers to maintain application configurations separately from the codebase, enhancing security and facilitating seamless application deployment across various environments.

In .env file we configure several configuration like Email, Database, Security, etc. We can use these or also we can create our own custom too.

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Let’s get started.

What is env?

env stands for Environment. It contains environment variables which we can use within entire application. By default we get env. But to use or access variables from it we need to do it as .env.

We get this env file at application root.

We have two options to do it as .env:

  • Rename env to .env
  • Copy file and rename it.

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.

Create Environment Variables

To define user defined variables there is very simple process to create. Open .env file and add your custom variables like this –


MY_FIRST_VARIABLE="This is first sample environment variable"
MY_SECOND_VARIABLE="Second environment variable for application"  


When your application runs, .env will be loaded automatically, and the variables put into the environment. If a variable already exists in the environment, it will NOT be overwritten.

Successfully, we can see we have added our own custom environment variables into .env file.

How To Use?

To access and use the value of environment variables we have few helper functions available by CodeIgniter 4.

We can use these function to any controller, any view to access value of it.

Available helper functions are –

  • getenv()
  • $_ENV[]
  • $_SERVER[]

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To access value of an environment variable, code be like this –

echo getenv('MY_FIRST_VARIABLE');





That’s it.

We hope this article helped you to learn about CodeIgniter How To Create Environment Variables Example 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