Cannot resize image in CodeIgniter

I just started programming a week or two ago, so I apologize for the potential terrible code, but I've been having a hard time figuring this one thing out.

I've managed to get the files to upload to the designated destination, but I just can't get the resize/image manipulation tool to work.

The code that's giving me the problem is the commented out section, and I've already made sure to give the folders the proper privileges. Any help would be outstanding.

I've also been curious about how I would use absolute paths for something like this:

function avatar_update() {
    $config['upload_path'] = './avatars/';
    $config['allowed_types'] = 'jpg';
    $config['max_size'] = '100';
    $config['max_width'] = '100';
    $config['max_height'] = '100';
    $config['file_name'] = time();

    $filename = $config['file_name'];

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

    if (!$this->upload->do_upload()) {
        $error = $this->upload->display_errors();
        $this->session->set_flashdata('msg', $error);
        $this->load->view('General/header');
        $this->load->view('profile_view', $error);
        $this->load->view('General/footer');

    } else {
        // $this->load->library('image_lib');

开发者_JS百科        // $resize['image_library'] = 'gd2';
        // $resize['source_image'] = './avatars/'.$filename.'.jpg';
        // $resize['maintain_ratio'] = TRUE;
        // $resize['create_thumb'] =TRUE;
        // $resize['width'] = 50;
        // $resize['height'] = 50;

        // $this->load->library('image_lib', $resize);

        // $this->image_lib->resize();

        $username = $this->session->userdata('username');
        $avatar = array(
            'avatar' => $filename
        );

        $this->db->where('username', $username);
        $this->db->update('users', $avatar);

        $this->db->select();
        $this->db->where('username', $username);
        $query = $this->db->get('users');

        if ($query->num_rows() > 0) {
            $user_details = $query->row_array();

        }

        $this->session->set_userdata($user_details);

        $this->load->view('General/header');
        $this->load->view('profile_view');
        $this->load->view('General/footer');
    }
}

Your code looks ok to me (except for loading the image library twice!). Try adding a path for the new image into your config array.

$resize['new_image'] = '/path/to/new_image.jpg';

You shouldn't need it, but it might be worth a try! Also, as per my comment you should wrap the resize() function in conditionals so you can test and echo any errors.

PS. When you get more used to CI and the MVC model think about moving all your db logic to a model.