using one function for frontend and backend - php

Question

I put my problem, I created a table "comments" then I maked a controller which two functions are implemented, function for reading and the one other for insertion.
What I need now is to realize function for managing comments, ie beside each comments there is an options delete and modify.
So,I add a new function that I named manage (), then, to avoid some repetition I think keep read (used to list the comments) and using it into manage() then add these stufs(modify,delete) beside each comment.
But I don't know how to proceed?
I need your advice help!
<?php
class Site extends CI_Controller {
public function __construct()
{
parent::__construct();
// Chargement des ressources pour tout le contrôleur
$this->load->database();
$this->load->helper('url');
$this->load->model('comments_model', 'livreorManager');
}
function index() {
$this->read();
// $this->add();
}
function read() {
$this->load->library('pagination');
$this->load->library('table');
$this->load->library('mytable');
$config['base_url'] = 'http://localhost/ci/index.php/site/index';
$config['total_rows'] = $this->db->get('comments')->num_rows();
$config['per_page'] = 5;
$config['num_links'] = 20;
$tmpl = array ( 'table_open' => '<table class="table table-striped">' );
$this->table->set_template($tmpl);
$config['full_tag_open'] = '<div class="pagination"><ul>';
$config['full_tag_close'] = '</ul></div>';
$this->pagination->initialize($config);
$this->db->order_by("id", "desc");
$data['records'] = $this->db->get('comments',$config['per_page'],$this->uri->segment(3));
$data['donnees'] = $data['records']->result_array();
$this->load->view('site_view', $data);
}
function add() {
$this->load->library('form_validation');
$this->form_validation->set_error_delimiters('<p class="form_erreur">', '</p>');
$this->form_validation->set_rules('pseudo', '"Pseudo"', 'trim|required|min_length[3]|max_length[25]|alpha_dash');
$this->form_validation->set_rules('comment', '"Comment"', 'trim|required|min_length[3]|max_length[3000]');
if($this->form_validation->run()) {
$this->livreorManager->add_comment($this->input->post('pseudo'),$this->input->post('comment'));
$this->load->view('success');
$this->read();
}
else {
$this->load->view('add');
}
}
function manage() {
// implément options into read
$this->read();
}
}