CodeIgniter驗證碼

Question

我已經創建了一些用於將數據插入到數據庫中並用於檢查數據是否從人發送的表單我已經使用了已經集成到CI中的CAPTCHA。

這是我的控制器：現在

$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); 
    } 

我的問題是什麼是驗證CAPTCHA的最佳方式？

1.）創建回調，我已經做了，但有問題，因爲當我發送表單是新的驗證碼錯誤。

2.）將CAPTCHA的代碼插入數據庫並從中檢查。問題是因爲會有很多的加載數據庫，它會很忙。

第二個問題。這個CAPTCHA只保存文件夾中的.jpg圖片，或者它可以是其他任何格式的文件？ （我問這個，因爲我想刪除使用後，他們此驗證碼是）

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

我建議你使用驗證碼這是很容易在笨實現：http://codeigniter.com/wiki/ReCAPTCHA