Database Reference Image Upload Wrong filename stored - php

Question

I am teaching myself codeigniter so I used the image uploading class with storing the name in SQL and storing the image on a folder in the server. When you call the name from the server it will display from the file.
So that works fine, but I was curious on overwriting images so I checked the codeignter documentation on uploading files and they have a encrypt_file file function. So that would fix a overwrite issue, well now since I used it the file name that is stored in my database is the original file while, the image that is stored in my folder on the server has a encrypted file name, so there for the photo does no display.
I have went through codeigniter's documentation, trying to load another filename variable and so on. I tried also initializing the config each time also.
The controller the Library Upload is auto.
if($this->form_validation->run()=== FALSE) {
$this->load->view('templates/header');
$this->load->view('posts/create', $data);
$this->load->view('templates/footer');
}
else{
//Upload image
$config['upload_path'] = 'assets/images/posts';
$config['allowed_types'] = 'gif|jpg|png';
$config['encrypt_name'] = TRUE; //TURN ON
$config['max_size'] = 0;
$config['max_width'] = 0;
$config['max_height'] = 0;
$this->upload->initialize($config);
if(!$this->upload->do_upload('userfile')){
$errors = array('error'=>$this->upload->display_errors());
$post_image = 'noimage.jpg';
}else {
$data = array('upload_data' =>$this->upload->data());
$post_image = $_FILES['userfile']['name'];
}
$this->Post_Model->create_post($post_image);
redirect('http://localhost/CI/');
}
}
MODEL
public function create_post($post_image){
$slug = url_title($this->input->post('title'));
$data=array('title' => $this->input->post('title'),
'slug' => $slug,
'body' => $this->input->post('body'),
'category_id' => $this->input->post('category_id'),
'post_image' =>$post_image
);
form
<img src="assets/images/posts/<?php echo $post['post_image'];?>">

Answer 1

First, Add the following configuration line of code to avoide overwrite $config['overwrite'] = false
Second, Give actual values to max_size, max_width and max_height not zero
$config['max_size'] = 1000;
$config['max_width'] = 430;
$config['max_height'] = 430;
$config['overwrite'] = false;
And where the file is uploading do some changes
if(!$this->upload->do_upload('userfile')){
$errors = array('error'=>$this->upload->display_errors());
$post_image = 'noimage.jpg';
}else {
$data = $this->upload->data();
$post_image = $data['file_name'];
}