早安 Stackoverflow，
我已经成功地在我的项目中实现了验证码助手。图像正在显示、保存等等，尽管图像本身在每次刷新后一次又一次地创建。刷新 10 次后，我的验证码文件夹包含 10 张图像。
这是正常的吗？
这是我的代码；
...
/**
* Method that returns the currently
* active Captcha code of the user.
*
* @access public
* @return string - user's captcha code
* @since v0.1.0.0
*/
public function get_captcha()
{
// Check for already existing captcha's.
if ($this->is_captcha())
{
// Get the captcha.
$data = $this->get_captcha_data();
}
else
{
// Create a new captcha.
if ($this->insert_captcha())
$data = $this->get_captcha_data();
}
// Set the values.
$captcha_vals = array(
'word' => $data['word'],
'img_path' => './media/sm_general/captcha/',
'img_url' => base_url().'media/sm_general/captcha/',
'img_width' => '175',
'img_height' => '60'
);
// Return the captcha.
return create_captcha($captcha_vals);
}
/**
* Method that returns the captcha data
* of a specific user.
*
* @access private
* @param string $field - (optional) specific to be returned data
* @return array/string - data of the captcha
* @since v0.1.0.0
*/
private function get_captcha_data($field='')
{
// Prepare the query.
$this->db->select('*');
$this->db->from('sm_sessions_captcha');
$this->db->where('ip_address',$this->input->ip_address());
$this->db->limit(1);
// Execute the query.
$query = $this->db->get();
// Get the result.
$result = $query->row_array();
// Return the data.
if ( ! empty($field))
return $result[$field];
else
return $result;
}
/**
* Method that returns a random word from
* the database.
*
* @access private
* @return string - randomly selected word
* @since v0.1.0.0
*/
private function get_word_random()
{
// Prepare the query.
$this->db->select('word');
$this->db->from('sm_sessions_captcha_words');
$this->db->order_by('word','RANDOM');
$this->db->limit(1);
// Execute the query.
$query = $this->db->get();
// Get the result.
$result = $query->row_array();
// Return the word.
return $result['word'];
}
/**
* Method that creates a new captcha image.
*
* @access private
* @return array
* @since v0.1.0.0
*/
private function insert_captcha()
{
// Prepare the query.
$data = array(
'captcha_time' => (time() + 7200),
'ip_address' => $this->input->ip_address(),
'word' => $this->get_word_random()
);
// Execute the query.
if ($this->db->insert('sm_sessions_captcha',$data))
return true;
else
return false;
}
/**
* Check if a captcha already exists.
*
* @access private
* @return boolean - exists or not
* @since v0.1.0.0
*/
private function is_captcha()
{
// Set the expiration time.
$expiration = time() - 7200;
// Remove all expired captchas.
$this->db->where('captcha_time <',$expiration);
$this->db->delete('sm_sessions_captcha');
// Prepare the query.
$this->db->select('*');
$this->db->from('sm_sessions_captcha');
$this->db->where('captcha_time >=',$expiration);
$this->db->where('ip_address',$this->input->ip_address());
$this->db->limit(1);
// Execute the query.
$query = $this->db->get();
// Return the existence.
if ($query->num_rows() == 1)
return true;
else
return false;
}
...
我不知道这是否按预期工作。如果我弄错了，请赐教。
干杯。