How To Use Flash Message in CodeIgniter 4?

Reading Time: 3 minutes

Flash messages are generally used to display some information to end users. For example, let’s say we have a form. When we save data, delete data etc then after doing operation we have to show a confirmation message to users that operation has been done.

Inside this article we will see how to use flash message in CodeIgniter 4 application.

Learn More –

• Compare Dates and Times in CodeIgniter 4 Tutorial
• Complete CodeIgniter 4 Basics Tutorial
• Complete CodeIgniter 4 Generators Tutorial
• Complete CodeIgniter 4 Model Events Tutorial

Here we will see the step by step implementation of flash messages using session. Let’s get started.

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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.

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.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.

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Create Controller

Open project in terminal and type the command.

$ php spark make:controller Site

Site.php is the controller file which will be created inside /app/Controllers

Flash Message

To create flash messages, we have several option to initiate and display into view files.

Let’s see each step in detail.

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Flash Message Settings

We will discuss each method to fire flash message and store data into it. Flash messages will be set inside controller methods.

Method #1

$session = session();

$session->setFlashdata("message", "This message is for end users #1");

$session->markAsFlashdata("message", "This message is for end users #1");

Method #2

session()->setFlashdata("message", "This message is for end users #2");

session()->markAsFlashdata("message", "This message is for end users #2");

Method #3

$_SESSION['message'] = 'This message is for end users #3';

session()->markAsFlashdata("message");

So here, we have the following ways to store a flash message in their respective keys. Let’s see how can we access these over View files of CodeIgniter 4.

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Render Flash Message To Views

To display a flash message again as above we have several ways.

Consider any of your view file of application. View files means the files from /app/Views folder.

Inside view file –

Method #1

<?= session("message") ?> or <?php echo session("message"); ?>

Method #2

<?= session()->getFlashdata("message") ?> 

or 

<?php echo session()->getFlashdata("message"); ?>

Method #3

Here, we are checking if message key exists or not.

<?php
    if(session()->has("message")){
         echo session("message");
    }
?>

OR

<?php
   if(session("message")){
         echo session("message");
   }
?>

We hope this article helped you to learn about How To Use Flash Message in CodeIgniter 4 Tutorial in a very detailed way.

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