gallery_model.php

<?php // filename: gallery_model.php

class Gallery_model extends CI_Model
{
    var $gallery_path;

    function __construct()
    {
        parent::__construct();
        $this->gallery_path = realpath(APPPATH . '../public_html/imgs/upload');
    }

    function do_upload()
    {
        $config = array(
            'allowed_types' => 'jpg|jpeg|gif|png',
            'upload_path' => $this->gallery_path
        );

        $this->load->library('upload', $config);
        $this->upload->do_upload();
    }
}