如何使用codeigniter驗證註冊頁面上的驗證碼？

Question

我已經嘗試了很多有關驗證驗證captcha與適合我的形式，但我仍然不明白如何驗證當$ word == $ this-> input-> post（'驗證碼'）然後驗證將是真實的（驗證成功）。

我有一個登記控制器波紋管（控制器/ registration.php的）

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

class Register extends CI_Controller { 

    function __construct(){ 
     parent::__construct(); 
     $this->load->library(array('form_validation')); 
     $this->load->library('image_lib'); 
     $this->load->helper(array('url','form','captcha')); 
     $this->load->model('m_account'); //call model 
    } 

    public function index() { 
     $dat = array(
      'img_path' => './static/', 
      'img_url' => 'http://localhost/ks/static/', 
      'img_width' =>'150', 
      'img_height' =>'50' 
      ); 
     $captcha = create_captcha($dat); 
     $this->form_validation->set_rules('username', 'USERNAME','required'); 
     $this->form_validation->set_rules('email','EMAIL','required|valid_email'); 
     $this->form_validation->set_rules('password','PASSWORD','required'); 
     $this->form_validation->set_rules('password_conf','PASSWORD','required|matches[password]'); 
     $this->form_validation->set_rules('captcha', 'Captcha', 'callback_validate_captcha'); 

     if($this->form_validation->run() == FALSE) { 
      $this->load->view('reader'); 
      $this->load->view('account/register',$captcha); 
      $this->load->view('footer'); 
     }else{ 

      $data['username'] = $this->input->post('username'); 
      $data['email'] = $this->input->post('email'); 
      $data['password'] = md5($this->input->post('password')); 

      $this->m_account->daftar($data); 

      $pesan['message'] = "Pendaftaran berhasil anda berhasil silahkan login"; 
      $this->load->view('reader'); 
      $this->load->view('account/sukses',$pesan); 

      $this->load->view('footer'); 
      header("refresh:1;url=login"); 
     } 
    } 
    public function validate_captcha(){ 
    if($this->input->post('captcha') != $this->$captcha) 
    { 
     $this->form_validation->set_message('validate_captcha', 'Wrong captcha code'); 
     return false; 
    }else{ 
     return true; 
    } 

這是我的形式註冊（意見/帳號/ register.php）：

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


    <div id="content"> 
    <h2>Pendaftaran Member Baru</h2> 

    <?php echo form_open('register');?> 

<div id=form_wrapper> 
<div class=form_title>Form Pendaftaran</div> 
    <div class=form_label>Username</div> 
    <div class=form_value><input type="text" maxlength="15" id="user" name="username" class="form_input" autocomplete="off" width="50" value="<?php echo set_value('username'); ?>"/> </div> 
    <div class=form_label>Email:</div> 
    <div class=form_value><input type="email" maxlength="100" name="email" id="email" class="form_input" autocomplete="off" value="<?php echo set_value('email'); ?>"/></div> 
    <p> <?php echo form_error('email'); ?> </p> 
    <div class=form_label>Password:</div> 
    <div class=form_value><input type="password" id="pass" maxlength="15" name="password" class="form_input" autocomplete="off" value="<?php echo set_value('password'); ?>"/></div> 
    <p> <?php echo form_error('password'); ?> </p> 
    <div class=form_label>Password Confirm:</div> 
    <div class=form_value><input type="password" id="pass" maxlength="15" name="password_conf" class="form_input" autocomplete="off" value="<?php echo set_value('password_conf'); ?>"/></div> 
    <p> <?php echo form_error('password_conf'); ?> </p> 

    <p> 
    <?php 
echo $image; 
echo $word; 
?> 
    <label for="name">Captcha: 
     <input id="captcha" name="captcha" type="text" value=""/> 
    </label></p> 
    <p> 
    <input type="submit" name="btnSubmit" value="Daftar" /> 
    </p> 
</div> 
    <?php echo form_close();?> 
</div> 
?> 

Answer 1

你應該嘗試此驗證碼。現在很流行。來自Google的開發者的禮物。

Google reCAPTCHA

什麼是驗證碼？ 易於添加，高級安全

reCAPTCHA是來自Google的免費服務，可保護您的網站免受垃圾郵件和濫用。它使用先進的風險分析技術來分辨人類和機器人。使用新的API，大量有效的人類用戶將通過reCAPTCHA挑戰，而無需解開CAPTCHA。 reCAPTCHA以小部件的形式出現，您可以輕鬆地將其添加到您的博客，論壇，註冊表等。More Info here