什么错误phpmyadmin - count（）：参数必须是一个数组或一个实现Countable的对象，行号：40

I want to count user in database to login, what wrong whith my code

public function index(){
    //validasi
    $valid = $this->form_validation;

    $valid->set_rules('username', ' Username', 'required',
                array('required'    => 'Username harus diisi'));
    $valid->set_rules('password', 'Password', 'required|min_length[6]',
                array('required'    => 'password harus diisi',
                      'min_length'  => 'Password minimal 6 karakter'));


    if($valid->run()===FALSE){
        //end validasi
        $data = array('title' => 'Login Admin Tempat Ngaji');
        $this->load->view('back-end/login_view', $data, FALSE);
    //cek username dan password
    }else{
        $i              = $this->input;
        $username       = $i->post('username');
        $password       = $i->post('password');
        //cek di database
        $check_login    = $this->admin_model->login($username, $password);

        //jika ada di db
        //jika ada data 1
        if(count($check_login) == 1) { `//row 40`
            $this->session->set_userdata('username', $username);
            $this->session->set_userdata('akses_level', $check_login->akses_level);
            $this->session->set_userdata('id_admin', $check_login->id_admin);
            $this->session->set_userdata('nama', $check_login->nama);
            $this->session->set_userdata('status', $check_login->status);
            redirect(base_url('admin/dashboard'), 'refresh');
        }else{
            //jika tidak cocok error
            $this->session->set_flashdata('msg', 'Username atau password tidak cocok');
            redirect(base_url('admin/login'), 'refresh');

        }

function login

function login
    public function login($username, $password){
        $this->db->select('*');
        $this->db->from('admin');
        $this->db->where(array('username'   => $username,
                                'password'  => sha1($password)));
        $query = $this->db->get();
        return $query->row();
    }

Looking for I saw that some have this error in their code, but I did not find anyone who received it in phpMyAdmin ...

What should I d

Try this:

MODEL:

public function login($username, $password){
        $this->db->select('*');
        $this->db->from('admin');
        $this->db->where(array('username'   => $username,
                                'password'  => sha1($password)));
        $query = $this->db->get();
        if ($query->num_rows() !== 1) {
            return false;
        }
        return $query->row();
    }

CONTROLLER:

    if($check_login) { `//row 40`
        $this->session->set_userdata('username', $username);
        $this->session->set_userdata('akses_level', $check_login->akses_level);
        $this->session->set_userdata('id_admin', $check_login->id_admin);
        $this->session->set_userdata('nama', $check_login->nama);
        $this->session->set_userdata('status', $check_login->status);
        redirect(base_url('admin/dashboard'), 'refresh');
    }else{
        //jika tidak cocok error
        $this->session->set_flashdata('msg', 'Username atau password tidak cocok');
        redirect(base_url('admin/login'), 'refresh');

    }

also sha1 like md5 isn't secure (SHA-1 is prone to length extension attacks):

Warning It is not recommended to use this function to secure passwords, due to the fast nature of this hashing algorithm. See the Password Hashing FAQ for details and best practices.

http://php.net/manual/en/function.sha1.php