Update Session value in Codeigniter 4

CodeIgniter provides session library that allows users to read, update, change, set, unset session values. In this tutorial, you will learn how to update session values ​​in CodeIgniter 4.

Here are steps to update session values:

• Step 1: Load the Session Library
• Step 2: Update Session Values
• Step 3: Save the Session
• Step 4: Check the Updated Session Values

Step 1: Load the Session Library

To use sessions in CodeIgniter, you need to load the session library. You can load the session library using the following code:

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

This code will load the session library that will allow users to work with sessions in your CodeIgniter application.

Step 2: Update Session Values

To update a session value in CodeIgniter, you can use the following code:

$this->session->set_userdata('key', 'new_value');

This code will update the session value for key ‘key’ with the new value ‘new_value’. If the session value does not exist for the key ‘key’, it will create a new session value with the key ‘key’ and set the value to ‘new_value’.

You can also update multiple session values at once by passing an array of key-value pairs to the set_userdata() method. For example:

$data = array(
    'key1' => 'new_value1',
    'key2' => 'new_value2',
    'key3' => 'new_value3'
);

$this->session->set_userdata($data);

This code will update the session values for the keys ‘key1’, ‘key2’, and ‘key3’ with the new values ‘new_value1’, ‘new_value2’, and ‘new_value3’, respectively.

Step 3: Save the Session

After updating the session values, you need to save the session using the following code:

This code will save the updated session data to the server.

$this->session->sess_write();

Step 4: Check the Updated Session Values

You can check the updated session values using the following code:

This code will retrieve the session value for the key ‘key’. If the session value does not exist, it will return NULL.

$value = $this->session->userdata('key');

Conclusion

Updating session values in CodeIgniter is a simple task that can be accomplished using the session library.

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