Refresh uploads images in code igniter without hitting upload button

Question

The image uploads and creates a thumbnail but whenever I refresh the page, the image last uploaded is uploaded again without me hitting the upload button. I don't know if it has something to do with this code

if ($this->input->post('upload')) {
$this->Gallery_model->do_upload();
}

Answer 1

It will request a new upload each time it finds $_POST['upload'];