Base_Controller::__construct PHP Method

    public function __construct()
    {
        parent::__construct();
        log_message('info', 'Base Controller Class Initialized');
        // Load session
        $this->load->library('session');
        $this->load->library('alert');
        // Load installer library and database config items
        $this->load->library('installer');
        // If 'config/updated.txt' exists, system needs upgrade
        if (is_file(IGNITEPATH . 'config/updated.txt')) {
            if ($this->installer->upgrade()) {
                redirect(admin_url('dashboard'));
            }
        }
        // Redirect to setup if app requires setup
        if (($installed = $this->installer->isInstalled()) !== TRUE and APPDIR !== 'setup') {
            redirect(root_url('setup'));
        }
        // If database is connected, then app is ready
        if ($this->installer->db_exists === TRUE) {
            // Load extension library
            $this->load->library('extension');
            // Load events library
            $this->load->library('events');
            // If the requested controller is a module controller then load the module config
            if (ENVIRONMENT !== 'testing') {
                if ($this->extension and $this->router and $_module = $this->router->fetch_module()) {
                    // Load the module configuration file and retrieve its items.
                    // Shows 404 error message on failure to load
                    $this->extension->loadConfig($_module, TRUE);
                }
            }
        }
        // Check app for maintenance in production environments.
        if (ENVIRONMENT === 'production') {
            // Show maintenance message if maintenance is enabled
            if ($this->maintenanceEnabled()) {
                show_error($this->config->item('maintenance_message'), '503', 'Maintenance Enabled');
            }
        }
        // Enable profiler for development environments.
        if (!$this->input->is_ajax_request()) {
            $this->output->enable_profiler(TI_DEBUG);
        }
        $this->form_validation->CI =& $this;
    }

 public function __construct()
 {
     parent::__construct();
     $this->helper->load('Exten');
     $this->model->load('action_db');
     $this->Load_Header();
 }