CodeIgniter - Form Validation

Validation is an important process while building web application. It ensures that the data that we are getting is proper and valid to store or process. CodeIgniter has made this task very easy. Let us understand this process with a simple example.
Create a view file myform.php and save the below code it in application/views/myform.php. This page will display form where user can submit his name and we will validate this page to ensure that it should not be empty while submitting.
<html>
 
   <head> 
      <title>My Form</title> 
   </head>
	
   <body>
      <form action = "" method = "">
         <?php echo validation_errors(); ?>  
         <?php echo form_open('form'); ?>  
         <h5>Name</h5> 
         <input type = "text" name = "name" value = "" size = "50" />  
         <div><input type = "submit" value = "Submit" /></div>  
      </form>  
   </body>
	
</html>
Create a view file formsuccess.php and save it in application/views/formsuccess.php. This page will be displayed if the form is validated successfully.
<html>
 
   <head> 
      <title>My Form</title>
   </head> 
	
   <body>  
      <h3>Your form was successfully submitted!</h3>  
      <p><?php echo anchor('form', 'Try it again!'); ?></p>  
   </body>
	
</html>
Create a controller file Form.php and save it in application/controller/Form.php. This form will either, show errors if it is not validated properly or redirected to formsuccess.php page.
<?php
  
   class Form extends CI_Controller { 
	
      public function index() { 
         /* Load form helper */ 
         $this->load->helper(array('form'));
			
         /* Load form validation library */ 
         $this->load->library('form_validation');
			
         /* Set validation rule for name field in the form */ 
         $this->form_validation->set_rules('name', 'Name', 'required'); 
			
         if ($this->form_validation->run() == FALSE) { 
         $this->load->view('myform'); 
         } 
         else { 
            $this->load->view('formsuccess'); 
         } 
      }
   }
?>
Add the following line in application/config/routes.php.
$route['validation'] = 'Form';

Let us execute this example by visiting the following URL in the browser. This URL may be different based on your site.
http://yoursite.com/index.php/validation

It will produce the following screen −
We have added a validation in the controller − Name is required field before submitting the form. So, if you click the submit button without entering anything in the name field, then you will be asked to enter the name before submitting as shown in the screen below.
After entering the name successfully, you will be redirected to the screen as shown below.
In the above example, we have used the required rule setting. There are many rules available in the CodeIgniter, which are described below.
The following is a list of all the native rules that are available to use −
required
matches
regex_match
differs
is_unique
min_length
max_length
exact_length
greater_than
greater_than_equal_to
less_than
less_than_equal_to
in_list
alpha
alpha_numeric
alpha_numeric_spaces
alpha_dash
numeric
integer
decimal
is_natural
is_natural_no_zero
valid_url
valid_email
valid_emails
valid_ip
valid_base64
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