表单验证在CodeIgniter中不起作用

Question

我无法在CodeIgniter中运行表单验证。它不会返回任何错误或任何提交到数据库。

当我使用

时

$this->form_validation->set_rules('subemail', 'Email', 'required|valid_email');

我的代码被执行但不是在下面的情况下。为什么呢？

控制器名称Form_sub：

class Form_sub extends CI_Controller {

        public function __construct() {
        parent::__construct();
        $this->load->database();
        $this->load->library('form_validation');
        #loading model
                $this->load->model('form_model');
                $this->load->helper(array("form",'url'));
     }#EOF CONSTRUCTOR

    public function index(){
        $this->load->view('form.php');
    }//default page
    public function subscribe(){
            echo "hello1"; 
            $config = array(
                    'field' => 'email',
                    'label' => 'email id',
                    'rules' => 'required|max_length[50]|min_length[5]|valid_email|trim|htmlspecialchars',
                    'errors'=>[
                        'required' => '* You must provide an %s',
                        'max_length' => '* %s should be of maximum 50 characters',
                        'min_length' => '* %s should be of minimum 5 characters',
                        'valid_email' => '* You must provide a valid %s'

                    ]
                )

            $this->form_validation->set_rules($config);
            echo "hello2"; 

            if($this->form_validation->run() == false){
              $this->load->view('form.php');
              echo "hello3"; 

            }

查看名称form.php：

<div class="row">
              <div class="col-xs-12 col-sm-6 col-md-8 col-lg-8">
              <?php echo form_open('form_sub/subscribe'); ?>
                <input name="email" id="" type="text" value="<?php echo set_value('email');?>" class="normal" placeholder="Email Address">

                   <?php echo form_error('email'); ?>     
              </div>
              <div class="col-xs-12 col-sm-6 col-md-4 col-lg-4 button">
<!--                <input type="submit" id="subsubmit" name="send" class="button" value="Subscribe">-->
                  <input type="submit" class="button" value="Subscribe">
                <?php echo form_close(); ?>
              </div>
            </div>

型号名称form_model：

class form_model extends CI_Model {
    public function __construct() {
         parent::__construct();

    }


        public function subscribe_insert($data)
                {
            if($this->db->insert('subscribe',$data))
                    {
                return true;
            }
            else
            {
                echo "something went wrong in the database";
            }
        }

}