Pagination Shows same results - php

Question

Using codeigniter 3 I have setup pagination. When I click on the next link I get the same results minus the first post, I cannot seem to find what is causing this.
I tried removing the offset and not allowing numbers, and I still have no change.
controller
public function index($offset = 0){
//Pagination
$config['base_url'] = base_url().'posts/index/';
$config['total_rows'] = $this->db->count_all('posts');
$config['uri_segment'] = 3;
$config['use_page_numbers'] = TRUE;
$config['per_page'] = 5;
$config['next_link'] = 'Next';
$config['prev_link'] = 'Previous';
$config['display_pages'] = FALSE;
$this->pagination->initialize($config);
$data['links'] = $this->pagination->create_links();
$data['title'] = 'Newest';
$data['posts'] = $this->post_model->get_posts(FALSE,$config['per_page'],$offset);
$this->load->view('templates/header');
$this->load->view('posts/index', $data);
$this->load->view('templates/footer');
}
model
public function get_posts($slug = FALSE, $limit=FALSE,$offset = FALSE){
if($limit){
$this->db->limit($limit,$offset);
}
if($slug === FALSE){
$this->db->order_by('created_time','DESC');
$this->db->join('categories','categories.id = posts.category_id');
$query = $this->db->get('posts');
return $query->result_array();
}
$query = $this->db->get_where('posts',array('slug'=>$slug));
return $query->row_array();
}
view
<ul class="pagination">
<?php echo $links; ?>
</ul>
///////////////////UPDATE/////////////
So this is how my code looks now after updating as your said.
public function index($offset=0){
//Pagination
$config['base_url'] = base_url().'posts/index/';
$config['total_rows'] = $this->db->count_all('posts');
$config['uri_segment'] = 3;
$config['num_links'] = 10;
$config['per_page']=3;
$limit = $config['per_page'];
$offset = ($offset) * ($config['per_page']);
this->pagination->initialize($config);
$data['posts'] = $this->post_model->get_posts(FALSE,$limit,$offset);
in the view I have it set to
<?php echo $this->pagination->create_links(); ?>
So now the issue is, it shows 3 rows(results) and when I click next it shows nothing and that's it, so now I am only getting 3 results only on the first page and none on the next pages. What is wrong?

Answer 1

Index Function Not Working Segment Use Query String

Answer 2

if $offset is current_page_number starting on 0, definition should be:
//number of rows to get
$limit = $config['per_page'];
//where start to get it
$offset = ($offset) * ($config['per_page']);
$data['posts'] = this->post_model->get_posts(FALSE,$limit,$offset);
If you define offset as current_page, starting on 1.
public function index($offset = 1){
......
//number of rows to get
$limit = $config['per_page'];
//where start to get it
$offset = ($offset - 1) * ($config['per_page']);
$data['posts'] = this->post_model->get_posts(FALSE,$limit,$offset);
Talking about "Index Function Not Working Segment Use Query String"...
If you have $config['enable_query_strings'] = TRUE you should GET it
public function index() {
$page = $this->input->get('page');
...
$offset = ($page - 1) * ($config['per_page']);
...