php - CodeIgniter 验证码验证

Question

我已经创建了一些表单来将数据插入数据库并检查数据是否是从人那里发送的，我使用了已经集成到 CI 中的验证码。

这是我的 Controller :

    $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);
    }

我现在的问题是验证验证码的最佳方式是什么？

1.) 创建回调，我已经完成了，但是出现了问题，因为当我发送表单时出现新的验证码错误。

2.) 将 CAPTCHA 的代码插入数据库并从中进行检查。问题是因为会加载很多数据库，会很忙。

第二个问题。这个验证码是只在文件夹中保存 .jpg 图片还是可以是任何其他格式？ (我问这个是因为我想在使用后删除这个验证码。)

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;
    }

}