in codeigniter Non-existent class: Commonlib is library file - php

Question

here is my library file
libraray file name Commonlib
<?php
class Commonlib extends CI_Controller
{
public function __construct()
{
parent::__construct();
$ci=& get_instance();
$ci->load->database();
}
function getcountries()
{
return $ci->db->get("countries")->result();
}
}
in config file
$autoload['libraries'] = array('database','Commonlib');
here is my view
$a = new Commonlib();
$results=$a->getcountries();
foreach ($results as $row) {
// country_id
echo ''.$row->country .'<br>';
}
show this error Non-existent class:
where is trouble ? how to solve it ?

Answer 1

The problem is here of naming convention. Because Class names and file names must match.
<?php
class Commonlib {
public function __construct() {
parent::__construct();
$ci=& get_instance();
$ci->load->database();
}
function getcountries(){
return $ci->db->get("countries")->result();
}
}
In view
$a = new Commonlib();
$results=$a->getcountries();
foreach ($results as $row)
{ // country_id
echo ''.$row->country .'<br>';
}

Answer 2

Library name should be like this CI_Commonlib ... Please try.

Answer 3

go To your library and change it with this code.
<?php
class your_library_Name {
function getcountries(){
return $ci->db->get("countries")->result();
}
}
and this is how to call it
$rec= $this->your_library_Name->getcountries();

Answer 4

You can do any of a few things.
By default most people will just drop their library into system/libraries, and load it with either with the autoloader, or $this->load->library(). If you do this, you must prefix your class name with CI_ so that CodeIgniter will recognize it, since the system folder is intended for stock files. In your case, you would need:
class CI_Commonlib extends CI_Controller
{
}
This works, but it mixes your custom code into CodeIgniter system files, which can become very messy when you want to upgrade your installation.
My recommendation is to create a separate folder for your custom files, and then add that path to your loader object. You will not need to make any changes to the code if you move your Commonlib object to application/libraries/Commonlib.php.
People will often add custom objects to system when they want to share files between multiple CodeIgniter installations. Multiple applications can share the same BASEPATH, so it makes sense to put your code where the shared directory already exists.
The problem with this is the same issue with an upgrade path, where custom objects mix with stock code, and may get confusing. In this case defining your own shared folder can be very helpful. CodeIgniter lets you do that with $this->load->add_package_path() You can move your shared code into custom/libraries and be off to the races. In that case, you can update your controller (not view) accordingly.
https://www.codeigniter.com/user_guide/libraries/loader.html
$this->load->add_package_path('custom/libraries');
$this->load->library('commonlib');