Display form validation error count in codeigniter V2

The following are the steps for showing the form validation error counts in codeigniter.
Step 1: Create a new file named MY_Form_validation.php under /application/libraries/. Remmeber to Ensure the following line is present in config.php
$config['subclass_prefix'] = 'MY_';

Step 2: Place the following code in the newly created MY_Form_validation.php:

class MY_Form_validation extends CI_Form_validation {

    public function __construct( $rules=array() )

    {

        parent::__construct($rules);

    }

    /*   This function will return the error count    */    

    function get_error_count()

    {

       return count($this->_error_array); 

    }

}

You can find more details about the core form validation class from here

Now you will be able to get the validation error count via the following code: 
$this->load->library('form_validation');

$this->form_validation->get_error_count();