codeigniter_tutorial

13. Session Management
CodeIgniter
When building websites, we often need to track user’s activity and state and for this
purpose, we have to use session. CodeIgniter has session class for this purpose.
Initializing a Session
Sessions data are available globally through the site but to use those data we first need
to initialize the session. We can do that by executing the following line in constructor.
$this->load->library('session');
After loading the session library, you can simply use the session object as shown below.
$this->session
Add Session Data
In PHP, we simply use $_SESSION array to set any data in session as shown below.
$_SESSION[‘key’] = value;
Where ‘key’ is the key of array and value is assigned on right side of equal to sign.
The same thing can be done in CodeIgniter as shown below.
$this->session->set_userdata('some_name', 'some_value');
set_userdata() function takes two arguments. The first argument, some_name, is the
name of the session variable, under which, some_value will be stored.
set_userdata() function also supports another syntax in which you can pass array to
store values as shown below.
$newdata = array(
'username' => 'johndoe',
);
'email'
'logged_in' => TRUE
=> 'johndoe@some-site.com',
$this->session->set_userdata($newdata);
55