打击回看看，为什么post过来的数据为空

 public function do_login() {
        $username = $_POST['txtUserName'];
        $userpwd = $_POST['txtUserPwd'];
        $code = $_POST['txtCode'];
        if ($code==$_SESSION['verify']) {
            $m = M('Manger');
            $where['username'] = $username;
            $where['userpwd'] = md5($userpwd);
            $i = $m->where($where)->count();
            if ($i > 0) {
                $this->redirect(__URL__ / main);
            } else {
                $this->error('用户名或密码错误');
            }
        } else {
            var_dump($_POST).'
';
            //var_dump($_SESSION['verify']);
            //$this->error('验证码错误');
        }
    }

Copyright 1998 - 2013 MOMU. All Rights Reserved.  版权所有

Copyright 1998 - 2013 MOMU. All Rights Reserved.  版权所有

$username = $_POST['txtUserName'];
$userpwd = $_POST['txtUserPwd'];
$code = $_POST['txtCode'];

echo $username;
echo $userpwd;
echo $code;
?>