CodeIgniter验证码

Question

我已经创建了一些用于将数据插入到数据库中并用于检查数据是否从人发送的表单我已经使用了已经集成到CI中的CAPTCHA。

这是我的控制器：现在

$checkrules = array(
     'img_path' => realpath(APPPATH . '../upload/checking/img') . '/', 
     'img_url' => base_url() . 'upload/checking/img/', 
     'font_path' => realpath(APPPATH . '../upload/checking/font.ttf'), 
     'img_width' => 150, 
     'img_height' => 30, 
     'expiration' => 7200 
    ); 

    $check = create_captcha($checkrules); 
    $data['checkimg'] = $check['image']; 

    $this->form_validation->set_rules('name', 'Name', 'required|max_length[40]|xss_clean'); 
    $this->form_validation->set_rules('email', 'E-mail', 'required|valid_email|xss_clean'); 
    $this->form_validation->set_rules('website', 'Website', 'max_length[80]|prep_url|xss_clean'); 
    $this->form_validation->set_rules('comment', 'Comment', 'required|xss_clean'); 
    $this->form_validation->set_rules('check', 'Check', 'required|xss_clean'); 

    if ($this->form_validation->run() == FALSE) 
    { 
     $this->load->view('cms/theme', $data); 
    } 
    else 
    { 
     echo "success"; 
     $this->load->view('cms/theme', $data); 
    } 

我的问题是什么是验证CAPTCHA的最佳方式？

1.）创建回调，我已经做了，但有问题，因为当我发送表单是新的验证码错误。

2.）将CAPTCHA的代码插入数据库并从中检查。问题是因为会有很多的加载数据库，它会很忙。

第二个问题。这个CAPTCHA只保存文件夹中的.jpg图片，或者它可以是其他任何格式的文件？ （我问这个，因为我想删除使用后，他们此验证码是）

Answer 1

* Example of captcha validation without database useage 
* Instead of it used session to store captcha value 
* The images will be deleted after the use 

---

public function index() 
{ 
    $this->load->helper(array('form', 'url','captcha')); 
    $this->load->library('form_validation'); 

     $this->form_validation->set_error_delimiters('<div class="error">', '</div>'); 
     $this->form_validation->set_rules('username', 'Username', 'trim|required|xss_clean'); 
     $this->form_validation->set_rules('password', 'Password', 'trim|required|xss_clean|callback_check_database'); 
     $this->form_validation->set_rules('captcha', 'Captcha', 'callback_validate_captcha'); 

    if($this->form_validation->run() == FALSE) 
     { 

     $original_string = array_merge(range(0,9), range('a','z'), range('A', 'Z')); 
     $original_string = implode("", $original_string); 
     $captcha = substr(str_shuffle($original_string), 0, 6); 

     //Field validation failed. User redirected to login page 
     $vals = array(
       'word' => $captcha, 
       'img_path' => './captcha/', 
       'img_url' => 'http://mycodeignitor.org/captcha/', 
       'font_path' => BASEPATH.'fonts/texb.ttf', 
       'img_width' => 150, 
       'img_height' => 50, 
       'expiration' => 7200 
     ); 

     $cap = create_captcha($vals); 
     $data['image'] = $cap['image']; 

     if(file_exists(BASEPATH."../captcha/".$this->session->userdata['image'])) 
      unlink(BASEPATH."../captcha/".$this->session->userdata['image']); 

     $this->session->set_userdata(array('captcha'=>$captcha, 'image' => $cap['time'].'.jpg')); 
     $this->load->view('index_index',$data); 
     } 
     else 
     { 
      if(file_exists(BASEPATH."../captcha/".$this->session->userdata['image'])) 
       unlink(BASEPATH."../captcha/".$this->session->userdata['image']); 

      $this->session->unset_userdata('captcha'); 
      $this->session->unset_userdata('image'); 
      redirect('home', 'refresh'); 
     } 



} 

public function validate_captcha(){ 
    if($this->input->post('captcha') != $this->session->userdata['captcha']) 
    { 
     $this->form_validation->set_message('validate_captcha', 'Wrong captcha code, hmm are you the Terminator?'); 
     return false; 
    }else{ 
     return true; 
    } 

} 

Answer 2

我建议你使用验证码这是很容易在笨实现：http://codeigniter.com/wiki/ReCAPTCHA