$this->load->helper('directory');
    $this->load->helper('file');
    $files = directory_map('./uploads/', 1);

    $test = [];
    if(!empty($files)) {
        foreach ($files as $f) {
            if (strpos($f, '/') === false && $f != 'index.php') {
                $file = $f;
                $explode = explode('_', substr($file, 0, -4));
                $user = $explode[0];
                $month = $explode[1];
                $year = $explode[2];
                $timestamp = strtotime($year . '-' . $month . '-15 00:00:00');
                $i = (isset($test[$year][$user])) ? count($test[$year][$user]) : 0;

                $test[$year][$user][$i]['month'] = $this->months[intval(date('n', $timestamp))];
                $test[$year][$user][$i]['file'] = $file;
                $test[$year][$user][$i]['timestamp'] = $timestamp;
            }
        }
    }

    var_dump($test);