Failing to connect to database - codeigniter

Question

When I run my localhost, I get these errors
A PHP Error was encountered Severity: Warning
Message: mysqli::real_connect(): (HY000/2002): A connection attempt
failed because the connected party did not properly respond after a
period of time, or established connection failed because connected
host has failed to respond.
Filename: mysqli/mysqli_driver.php
Line Number: 203
Backtrace:
File: C:\xampp\htdocs\ciblog\application\models\Post_model.php Line: 4
Function: database
File: C:\xampp\htdocs\ciblog\index.php Line: 315 Function:
require_once
A Database Error Occurred Unable to connect to your database server
using the provided settings.
Filename: C:/xampp/htdocs/ciblog/system/database/DB_driver.php
Line Number: 436
I already tried to change the hostname to "mysql.hostingprovider.com:3306" but still get the error:
database.php file
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
$active_group = 'default';
$query_builder = TRUE;
$db['default'] = array(
'dsn' => '',
'hostname' => 'mysql.hostingprovider.com:3306',
'username' => 'root',
'password' => '123456',
'database' => 'posts',
'dbdriver' => 'mysqli',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => (ENVIRONMENT !== 'production'),
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
);
Post_model.php file
<?php
class Post_model extends CI_Model{
public function __construct(){
$this->load->database();
}
public function get_posts($slug = FALSE){
if($slug === FALSE){
$query = $this->db->get('posts');
return $query->result_array();
}
$query = $this->db->get_where('posts', array('slug' => $slug));
return $query->row_array();
}
}
post.php file
<?php
class Posts extends CI_Controller{
public function index (){
$data['title'] = 'Latest Posts';
$data['posts'] = $this->post_model->get_posts();
print_r($data['post']);
$this->load->view('templates/header');
$this->load->view('posts/index', $data);
$this->load->view('templates/footer');
}
}

Answer 1

Change hostname:
*$db['default'] = array(
'dsn' => '',
'hostname' => 'localhost',
............*