Helper\Utils::randomChar PHP Метод

    public static function randomChar($length = 8)
    {
        // 密码字符集，可任意添加你需要的字符
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $char = '';
        for ($i = 0; $i < $length; $i++) {
            $char .= $chars[mt_rand(0, strlen($chars) - 1)];
        }
        return $char;
    }

 /**
  * 淘宝自动发货API
  * 创建卡号
  *
  * @JSON
  */
 public function createCard()
 {
     $CURR_KEY = $_SERVER['HTTP_AUTHORIZATION'];
     if (!$CURR_KEY) {
         header("HTTP/1.1 405 Method Not Allowed");
         exit;
     }
     $KEY = Option::get('SYSTEM_API_KEY');
     if ($KEY == null) {
         $KEY = password_hash(Utils::randomChar(12) . time(), PASSWORD_BCRYPT);
         Option::set('SYSTEM_API_KEY', $KEY);
     }
     $CURR_KEY = str_replace('Basic ', '', $CURR_KEY);
     $CURR_KEY = md5($CURR_KEY . ENCRYPT_KEY);
     $KEY = md5($KEY . ENCRYPT_KEY);
     if (strtoupper($KEY) == strtoupper($CURR_KEY)) {
         $card = new Card();
         $card->card = substr(hash("sha256", time() . Utils::randomChar(10)) . time(), 1, 26);
         $card->add_time = time();
         $card->type = intval(trim($_POST['type']));
         $card->info = trim($_POST['info']);
         $card->status = 1;
         $card->save();
         return array('error' => 0, 'message' => 'success', 'card' => $card);
     } else {
         return array('error' => 1, 'message' => 'Bad Request');
     }
 }