user.php

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

class User extends CI_Controller {
	public function register()
	{
		$this->load->view('register');
	}

	public function login(){
		$this->load->view('login');	
	}

	public function registering(){
		$account = $this->input->post("account");
		$password= $this->input->post("password");
		$passwordrt= $this->input->post("passwordrt");
		
		if( trim($password) =="" || trim($account) =="" ){
			$this->load->view('register',Array(
				"errorMessage" => "Account or Password shouldn't be empty,please check!" ,
				"account" => $account
			));
			return false;
		}

		if( $password != $passwordrt ){
			//如果不一致，我們讀取 register view，
			//但將 $account 跟錯誤訊息帶入作為處理
			$this->load->view('register',Array(
				"errorMessage" => "Password doesn't match re-type password,please check yout input!" ,
				"account" => $account
			));
			return false;
		}

		$this->load->model("UserModel");

                if($this->UserModel->checkUserExist(trim($account))){ //檢查帳號是否重複
			$this->load->view('register',Array(
				"errorMessage" => "This account is already in used." ,
				"account" => $account
			));
			return false;
		}

		$this->UserModel->insert(trim($account),trim($password));  //完成新增動作
	}

}