How to use dynamodb for sessions in codeigniter?

@daisha 

To use DynamoDB for sessions in CodeIgniter, you can follow these steps:

1. Install the AWS SDK for PHP: First, install the AWS SDK for PHP using Composer by running the following command:

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composer require aws/aws-sdk-php

1. Configure AWS credentials: Next, make sure you have your AWS credentials set up in your environment, either through environment variables or in the AWS credentials file located at ~/.aws/credentials.
2. Create a DynamoDB table for sessions: Create a DynamoDB table to store sessions. You can use the AWS Management Console or the AWS CLI to create the table. Make sure the table has a primary key named "id" of type string.
3. Create a session library for CodeIgniter: Create a new session library file in the application/libraries directory of your CodeIgniter project. You can name it Dynamodb_session.php for example.
4. Configure the session library: In the Dynamodb_session.php file, configure the session handler using the AWS SDK for PHP. You can follow the example code below:

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<?php
use AwsSdk;
use AwsDynamoDbSessionHandler;

class Dynamodb_session {

    public function __construct()
    {
        $sdk = new Sdk([
            'region'   => 'us-east-1',
            'version'  => 'latest',
            'credentials' => [
                'key'    => 'your_aws_key',
                'secret' => 'your_aws_secret',
            ]
        ]);

        $dynamodb = $sdk->createDynamoDb();
        $handler = SessionHandler::fromClient($dynamodb, [
            'table_name' => 'your_table_name'
        ]);

        session_set_save_handler($handler, true);
        session_start();
    }
}

1. Load the session library in CodeIgniter: In your CodeIgniter controller or model, load the session library you created by calling:

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$this->load->library('dynamodb_session');

1. Test the session handling: You can now start using sessions in your CodeIgniter application. Add session variables using $_SESSION['key'] = 'value'; and retrieve them using $_SESSION['key'];.

That's it! You have now configured DynamoDB for sessions in CodeIgniter.