ci-pt1-user_controller.php

<?php
class Users extends Controller {
	
	function users()
	{
		parent::Controller();
		
		$this->load->model('User_model');
	}
	
	function register()
	{
		// Set form validation rules
		$this->form_validation->set_rules('first_name', 'First Name', 'required');
		$this->form_validation->set_rules('last_name', 'Last Name', 'required');
		$this->form_validation->set_rules('email', 'Email', 'required|valid_email');
		$this->form_validation->set_rules('pass1', 'Password', 'required|matches[pass2]');
		$this->form_validation->set_rules('pass2', 'Password Confirmation', 'required');
		
		if ($this->form_validation->run() == FALSE)
		{
			$this->load->view('registration_form.php');
		}
		else
		{
			// Form validation passed, lets add the user to the database
			
			// Store the inputs in an array to push to the model
			$user_array = array(
				'first_name' => $this->input->post('first_name'),
				'last_name' => $this->input->post('last_name'),
				'email' => $this->input->post('email'),
				'password' => sha1($this->input->post('pass1'))
			);
			
			// Add the user array to the model
			$success = $this->User_model->add_user($user_array);
			
			// If the model returns true, the insert took place
			if($success)
			{
				echo 'success';
			}
			else
			{
				echo 'fail';
			}
		}
	}
}