Callback function for form validation in config file

Question

I'm trying to do an email validation whereby the domain of the email would be @abc123.com. I've separated my form validation rules into another file in the application/config folder called form_validation.php. One of my rules consists of a callback_email_check.

Where should I put the function? In the main controller or together with the form_validation.php file where all my form validation rules are? I've tried putting at both options but at where I display my error message I'm getting an output saying Unable to access an error message corresponding to your field name Email.(email_check).

function email_check($email)
{
    if( strpos($email, '@abc123.com') !== FALSE ) return TRUE;

    $this->form_validation->set_message('email', 'Please use abc123 email only.');

    return FALSE;
}

form_validation.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/* Form Validation Rules */

$config = array(
    'login' => array(
            array(
                    'field' => 'user_id',
                    'label' => 'User ID',
                    'rules' => 'trim|required'
            ),
            array(
                    'field' => 'password',
                    'label' => 'Password',
                    'rules' => 'trim|required'
            )
    ),
    'sign_up' => array(
            array(
                    'field' => 'user_id',
                    'label' => 'User ID',
                    'rules' => 'trim|required'
            ),
            array(
                    'field' => 'name',
                    'label' => 'Name',
                    'rules' => 'trim|required'
            ),
            array(
                    'field' => 'email',
                    'label' => 'Email',
                    'rules' => 'trim|required|valid_email|callback_email_check'
            ),
            array(
                    'field' => 'department',
                    'label' => 'Department',
                    'rules' => 'trim|required'
            ),
            array(
                    'field' => 'password',
                    'label' => 'Password',
                    'rules' => 'trim|required'
            ),
            array(
                    'field' => 'cfm_password',
                    'label' => 'Re-type Password',
                    'rules' => 'trim|required|matches[password]'
            )
    ),
    'edit_profile' => array(
            array(
                    'field' => 'new_password',
                    'label' => 'New Password',
                    'rules' => 'trim|required'
            ),
            array(
                    'field' => 'retype_password',
                    'label' => 'Re-type Password',
                    'rules' => 'trim|required|matches[new_password]'
            )
    ),
    'forgot_password' => array(
            array(
                    'field' => 'user_id',
                    'label' => 'User ID',
                    'rules' => 'trim|required'
            ),
            array(
                    'field' => 'email',
                    'label' => 'Email',
                    'rules' => 'trim|required|valid_email|callback_email_check'
            )
    )
);
?>

Answer 1

On your function email_check, the set_message is not correct it should be the same name as the function.

Change this

$this->form_validation->set_message('email', 'Please use abc123 email only.');

To

$this->form_validation->set_message('email_check', 'Please use abc123 email only.');

Call backs http://www.codeigniter.com/userguide2/libraries/form_validation.html#callbacks