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Custom Validation in codeigniter?

we can use custom validation in two ways.

By Using Callbacks.

By Extend CodeIgniter’s Form Validation library.

Custom validation Rules Using Callbacks

define your custom rule with callback_ prefix ,

$this->form_validation->set_rules('email_address', '"Email address"', 'trim|callback_email_check');

Then add the method in the controller. This method needs to return either TRUE or FALSE

function email_check($value)
{
if($value) { // do your validations
return TRUE;
} else {
return FALSE;
}
}

The Final Step ,create a corresponding error Message to show on validation fail

$this->form_validation->set_message('email_check','Email is not valid');

Custom validation Rules By Extend CodeIgniter’s Form Validation library

Create a new PHP’s Class file named MY_Form_validation.php and put it in the application/libraries/ directory, and extend it with CodeIgniter’s validation library.

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

class MY_Form_validation extends CI_Form_validation {
protected $CI;
function __construct() {
parent::__construct();
// reference to the CodeIgniter super object
$this->CI =& get_instance();
}
function email_check($str) {
$this->CI->form_validation->set_message('email_check', 'The %s is not valid.');
if($value) { // do your validations
return TRUE;
} else {
return FALSE;
}
}
}

now add this to your validation rules

$this->form_validation->set_rules('email_address', '"Email address"', 'trim|email_check');

Example : callback

$this->form_validation->set_rules('year', 'Year', 'trim|required|xss_clean|callback_year_validation');

How to validate only alpha character with space in codeigniter?

^ and $ Tells that it is the beginning and the end of the string
a-z are lowercase letters, A-Z are uppercase letters
\s is whitespace and + means 1 or more times.

$this->form_validation->set_rules('full_name', 'Full Name', 'min_length[7]|trim|required|callback_alpha_space');

function alpha_space($fullname){
if (! preg_match('/^[a-zA-Z\s]+$/', $fullname)) {
$this->form_validation->set_message('alpha_space', 'The %s field contain only alpha characters & White spaces');
return FALSE;
} else {
return TRUE;
}
}

How to validate only alpha-numeric, dashes, spaces in codeigniter?

^ and $ Tells that it is the beginning and the end of the string
a-z are lowercase letters, A-Z are uppercase letters
\s is whitespace and + means 1 or more times.

$this->form_validation->set_rules('full_name', 'Full Name', 'trim|required|callback_alpha_space');

public function alpha_numeric_dash_space($str='')
{
if (! preg_match("/^([-a-z0-9_ ])+$/i", $str))
{
$this->form_validation->set_message('alpha_numeric_dash_space', 'The %s field only contain alpha-numeric,underscores & dashes.');
return FALSE;
}
else
{
return TRUE;
}
}

Alpha characters and space.

$this->form_validation->set_rules('field', 'Field', 'regex_match[/^([a-z ])+$/i]');

$this->form_validation->set_rules('name', 'Name', trim|required|callback_alpha_dash_space');

function alpha_dash_space($str)
{
return ( ! preg_match("/^([-a-z_ ])+$/i", $str)) ? FALSE : TRUE;
}

array(
'field'=>'ptitle',
'label'=>'Property Title',
'rules'=>'trim|required|xss_clean|regex_match[/^[][a-zA-Z0-9@# ,().]+$/]'
)

Itechtuto

Codeigniter Tutorials

Custom Validation in codeigniter?

we can use custom validation in two ways.

Custom validation Rules By Extend CodeIgniter’s Form Validation library

Example : callback

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