我创建了某种形式，用于将数据插入数据库并检查数据是否来自人类，我使用了已经集成到CI中的CAPTCHA。
这是我的控制器：
$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法是什么？
1.） 创建回调，我已经完成了，但存在问题，因为当我发送表单时，新的 CAPTCHA 代码出错。
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加载数据库并且会非常繁忙。
第二个问题。此验证码是否仅将.jpg图片保存在文件夹中，或者它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。
* 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;
}
}
我建议你使用在codeigniter中易于实现的recaptcha：http://codeigniter.com/wiki/ReCAPTCHA