Adding custom callback to Codeigniter Form Validation - php

Question

I want to limit my registration to emails with #mywork.com I made the following in My_Form_validation.
public function email_check($email)
{
$findme='mywork.com';
$pos = strpos($email,$findme);
if ($pos===FALSE)
{
$this->CI->form_validation->set_message('email_check', "The %s field does not have our email.");
return FALSE;
}
else
{
return TRUE;
}
}
I use it as follows. I use CI rules for username and password and it works, for email it accepts any email address. Any I appreciate any help.
function register_form($container)
{
....
....
/ Set Rules
$config = array(
...//for username
// for email
array(
'field'=>'email',
'label'=>$this->CI->lang->line('userlib_email'),
'rules'=>"trim|required|max_length[254]|valid_email|callback_email_check|callback_spare_email"
),
...// for password
);
$this->CI->form_validation->set_rules($config);

Answer 1

The problem with creating a callback directly in the controller is that it is now accessible in the url by calling http://localhost/yourapp/yourcontroller/yourcallback which isn't desirable. There is a more modular approach that tucks your validation rules away into configuration files. I recommend:
Your controller:
<?php
class Your_Controller extends CI_Controller{
function submit_signup(){
$this->load->library('form_validation');
if(!$this->form_validation->run('submit_signup')){
//error
}
else{
$p = $this->input->post();
//insert $p into database....
}
}
}
application/config/form_validation.php:
<?php
$config = array
(
//this array key matches what you passed into run()
'submit_signup' => array
(
array(
'field' => 'email',
'label' => 'Email',
'rules' => 'required|max_length[255]|valid_email|belongstowork'
)
/*
,
array(
...
)
*/
)
//you would add more run() routines here, for separate form submissions.
);
application/libraries/MY_Form_validation.php:
<?php
class MY_Form_validation extends CI_Form_validation{
function __construct($config = array()){
parent::__construct($config);
}
function belongstowork($email){
$endsWith = "#mywork.com";
//see: http://stackoverflow.com/a/619725/568884
return substr_compare($endsWith, $email, -strlen($email), strlen($email)) === 0;
}
}
application/language/english/form_validation_lang.php:
Add: $lang['belongstowork'] = "Sorry, the email must belong to work.";

Answer 2

Are you need validation something like this in a Codeigniter callback function?
$this->form_validation->set_rules('email', 'email', 'trim|required|max_length[254]|valid_email|xss_clean|callback_spare_email[' . $this->input->post('email') . ']');
if ($this->form_validation->run() == FALSE)
{
// failed
echo 'FAIL';
}
else
{
// success
echo 'GOOD';
}
function spare_email($str)
{
// if first_item and second_item are equal
if(stristr($str, '#mywork.com') !== FALSE)
{
// success
return $str;
}
else
{
// set error message
$this->form_validation->set_message('spare_email', 'No match');
// return fail
return FALSE;
}
}

Answer 3

A correction to Jordan's answer, the language file that you need to edit should be located in
system/language/english/form_validation_lang.php
not application/.../form_validation_lang.php. If you create the new file under the application path with the same name, it will overwrite the original in the system path. Thus you will lose all the usage of the original filters.