Update Session value in Codeigniter

Updating session values in CodeIgniter is a common task that developers may need to perform. In this tutorial, you will learn how to update session values in CodeIgniter.

How to Update Session value in Codeigniter

Sure, here are the steps to update session values in CodeIgniter:

• 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. The session library is responsible for managing sessions in CodeIgniter.

You can load the session library using the following code:

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

This code will load the session library, which will allow you 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 the key ‘key’ with the new value ‘new_value’. If the session value for the key ‘key’ does not exist, 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. By following the steps outlined in this article, you can easily update session values in your CodeIgniter application.

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