CodeIgniter: How to set session and/or controller variables in hooksr?

So I'm having trouble making my hooks actually do anything. I'd like to set a few session variables before views are rendered every time. I have put this in my config/hooks.php:

$hook['post_controller_constructor'] = array(
    'class'    => 'Permissions',
    'function' => 'can_view',
    'filename' => 'pre_hooks.php',
    'filepath' => 'hooks');

I've also enabled hooks in the config file:

$c开发者_C百科onfig['enable_hooks'] = TRUE;

The code I'm trying to make work:

<?php
class Permissions {
    var $CI;

    public function __construct() {
        $this->CI = &get_instance();
        $this->CI->load->library("session");
    }

    public function can_view(){
        $this->CI->session->set_userdata('test','test');
    }
}

A simple echo of the session variable doesn't work, but when I set the session variable in a controller, it works...

Not showing some controller's code, but if you are loading session library twice, in hook and controllers code, may be the second load reinitializes the $this->CI->session. CI takes care of not load twice, but initialices in each attempt. You can check if double load is happening by enabling logs, you will find a message warning you of that.

Please try autoloading the session lib.