CodeIgniter creating multiple custom Form_validation extension classes - php

Question

I know that I can make a file called MY_Form_validation based on the default
$config['subclass_prefix'] = 'MY_';
But what if I have different forms that I want to represented with different MY_Form_validation classes? If this is possible, how will I load and call it in my validation controller?
For example MY_Student_registration_form_validation, MY_Student_cancellation_form_validation, and so on?
Most of the question online just straightforward suggest creating this sole class but not for multiple instances.
NOTE I tried creating MY_Student_registration_form_validation class inside application/libraries (CI 3.x) and loaded it in my controller using
$this->load->library('my_student_registration_form_validation');
and I got the error Non-existent class: My_student_registration_form_validation.
Then I tried without the prefix MY
$this->load->library('student_registration_form_validation');
and I got a different one Unable to load the requested class: Student_registration_form_validation.

Answer 1

Alright kids I got it now.
Create your custom form validation class with the prefix MY_ or whatever you declared in the application/config/config.php file. For example, MY_Student_registration_form_validation inside application/libraries for CI 3.x.
$config['subclass_prefix'] = 'MY_';
In your controller (I will use controller here since I haven't tested it on a model), you can load this custom class by:
$this->load->library('my_student_registration_form_validation');
You can now use its methods by:
$this->my_student_registration_form_validation->validate_student();

Answer 2

Put this piece at the end of APPPATH.'config/config.php' file
spl_autoload_register(function ($class) {
//this block you can skip
if (substr($class,0,3) !== 'CI_') {
if (file_exists($file = APPPATH.'core/'.$class.'.php')) {
include $file;
}
}
//this block is what you need
if (substr($class,0,3) !== 'CI_') {
if (file_exists($file = APPPATH.'libraries/'.$class.'.php')) {
include $file;
}
}
});
This way, you don't even set config file's predefined MY_ prefix.
Name your files and classes like:
Student_registration_form_validation.php | Student_registration_form_validation
Student_cancellation_form_validation.php | Student_cancellation_form_validation
Some_controller_code.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Some_controller_code extends CI_Controller
{
public function __construct()
{
parent::__construct();
}
public function index()
{
//you have to load form_validation library first
//if custom libraries are extending it
$this->load->library('form_validation');
$this->load->library('student_registration_form_validation');
//example of using method from native form_validation library
if ( $this->student_registration_form_validation->set_message('rule1', "Some message here") )
echo 'It\'s working';
}
}