Turn array into multidimensional assoc array

Question

I have a problem with creating a dynamic assoc array based on a string.

For example the following piece of code:

Session::addSession('browser.history','stackoverflow');

This should return the following array: $_SESSION[TL_MODE]['browser']['history'] = 'stackoverflow';

Current addSession function:

public static function addSession($type, $value) {
            $_SESSION[TL_MODE][$type] = $value;
    }

I have been working on this for a couple of days and I still don't have a solution.

I hope someone could help me solve this problem, or if my approach is just wrong, I would like to know how I can achieve the same goal with a different approach.

---UPDATE---

Thanks to someone who saw this was a duplicated question. This is how I fixed it for my situation:

$temp = &$_SESSION[TL_MODE];
        $exploded = explode('.', $path);
        foreach($exploded as $key) {
            if(!is_array($temp[$key])) {
                $temp[$key] = array();
            }
            $temp = &$temp[$key];
        }
        $temp[] = $value;
        unset($temp);