代码点火器:验证不会停止

我很确定我刚刚错过了一些非常明显的东西，但在我看来，我无法弄清楚是什么。 空表单验证工作正常，但是当我在输入框中输入任何随机值并单击登录时，它会显示'This is working fine';，所以我有一种感觉，这与我的回调函数有关。

我正在尝试这样做，以便该人可以使用他们的用户名或密码登录

验证：

'loginUser' => array(
        array(
            'field' => 'userLoginUsername',
            'label' => 'Username',
            'rules' => 'trim|required|xss_clean'
        ),
        array(
            'field' => 'userLoginPassword',
            'label' => 'Password',
            'rules' => 'trim|required|callback__check_login|xss_clean|sha1'
        )
    )// End of login user array

回调：

function _check_login($username, $password)
{
    if($this->users_model->login_check($username,$password))
    {
        $this->form_validation->set_message('_check_login', 'Sorry you have entered an incorrect %s ');
        return FALSE;
    }else{
        return TRUE;
    }
}

控制器：

function login()
    {
        if($this->form_validation->run('loginUser') == FALSE)
        {
            $data['success'] = '';
        }else{
            echo 'This is working fine';
        }
        $data['companyName'] = $this->core_model->companyDetails()->coreCompanyName;
        $data['pageTitle'] = "User Login";
        $this->load->view('frontend/assets/header', $data);
        $this->load->view('frontend/user_login', $data);
        $this->load->view('frontend/assets/footer');
    }   
}

型：

function login_check($username, $password)
    {
        $this->db->select('userName,userEmail,userPassword');
        $this->db->from('users');
            $this->db->where('userName', $username, 'userEmail', $username, 'userPassword' , $password, 'userActive', 1);
        $query = $this->db->get();
        if($query->num_rows() == 1)
        {
            return TRUE;
        }else{
            return FALSE;
        }
    }

视图：

<h1><?php echo $companyName; echo nbs(1);?> - <?php echo $pageTitle; ?></h1>
    <div class="formComments">
        <p class="error"><?php echo validation_errors();?></p>
        <p class="success"><?php echo $this->session->flashdata('success'); ?></p>
        </div>
<div class="user_login">
    <form class="form-inline" method="POST" action="login" >
        <input type="text" name="userLoginUsername" id="userLoginUsername" class="input-small" placeholder="Username">
        <input type="password" name="userLoginPassword" id="userLoginPassword" class="input-small" placeholder="Password">
        <button type="submit" class"btn">Login</button>
        </form>
    </div>