How to Retrieve session id

Please check  the attachment  give me solutions....

please check config file session code:-
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$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

Attached Files

  Admin.php (Size: 809 bytes / Downloads: 88)
  login.php (Size: 796 bytes / Downloads: 87)
  loginmodel.php (Size: 336 bytes / Downloads: 118)
  propertymodel.php (Size: 334 bytes / Downloads: 108)
  dashboard.php (Size: 1.26 KB / Downloads: 133)