在CodeIgniter中设置会话错误

我试图在codeigniter中设置会话。当某人尝试使用电子邮件id和密码登录时

1）使用电子邮件id查找他/她的角色。然后在会话中返回该结果并重定向到相应的链接。我在下面键入的代码。你能解决这个问题吗

控制器

public function login_validation() {
        $this -> load -> library('form_validation');
        $this -> form_validation -> set_rules('email', 'Email', 'required|trim');
        $this -> form_validation -> set_rules('password', 'Password', 'required ');

        if ($this -> form_validation -> run()) {

            $this -> load -> model('model_database');
            $sessiondata['var_userrole'] = $this -> model_database -> login_session();

            $this -> session -> set_userdata($sessiondata);
            if ($var_userrole == admin) {

                redirect('welcome/admin');

            } else if ($var_userrole == staff) {

                redirect('welcome/staff');

            } else if ($var_userrole == student) {

                redirect('welcome/student');

            } else {

                redirect('welcome/login');

            }

public function login_validation() {
        $this -> load -> library('form_validation');
        $this -> form_validation -> set_rules('email', 'Email', 'required|trim');
        $this -> form_validation -> set_rules('password', 'Password', 'required ');

        if ($this -> form_validation -> run()) {

            $this -> load -> model('model_database');
            $var_userrole = $this -> model_database -> login_session();// was undefined 
            $sessiondata['var_userrole'] = $var_userrole

            $this -> session -> set_userdata($sessiondata);
            if ($var_userrole == admin) {

                redirect('welcome/admin');

            } else if ($var_userrole == staff) {

                redirect('welcome/staff');

            } else if ($var_userrole == student) {

                redirect('welcome/student');

            } else {

                redirect('welcome/login');

            }

型号

public function login_session() {
    $email = $this -> input -> post('email');
    $login_id = $this -> db -> query("SELECT var_userrole FROM tbl_login where var_email = '" . $email . "'");
    return  $login_id -> row_array();
}

public function login_session() {
    $email = $this -> input -> post('email');
    $login_id = $this -> db -> query("SELECT var_userrole FROM tbl_login where var_email = '" . $email . "'");
      //$row =  $login_id -> row() // as object return $row->var_userrole;
      $row =  $login_id -> row_array();
    return $row['var_userrole']
}

---

首先，在您签入if语句的任何地方都没有定义$var_userrole

控制器

public function login_validation() {
        $this -> load -> library('form_validation');
        $this -> form_validation -> set_rules('email', 'Email', 'required|trim');
        $this -> form_validation -> set_rules('password', 'Password', 'required ');

        if ($this -> form_validation -> run()) {

            $this -> load -> model('model_database');
            $sessiondata['var_userrole'] = $this -> model_database -> login_session();

            $this -> session -> set_userdata($sessiondata);
            if ($var_userrole == admin) {

                redirect('welcome/admin');

            } else if ($var_userrole == staff) {

                redirect('welcome/staff');

            } else if ($var_userrole == student) {

                redirect('welcome/student');

            } else {

                redirect('welcome/login');

            }

public function login_validation() {
        $this -> load -> library('form_validation');
        $this -> form_validation -> set_rules('email', 'Email', 'required|trim');
        $this -> form_validation -> set_rules('password', 'Password', 'required ');

        if ($this -> form_validation -> run()) {

            $this -> load -> model('model_database');
            $var_userrole = $this -> model_database -> login_session();// was undefined 
            $sessiondata['var_userrole'] = $var_userrole

            $this -> session -> set_userdata($sessiondata);
            if ($var_userrole == admin) {

                redirect('welcome/admin');

            } else if ($var_userrole == staff) {

                redirect('welcome/staff');

            } else if ($var_userrole == student) {

                redirect('welcome/student');

            } else {

                redirect('welcome/login');

            }

型号

public function login_session() {
    $email = $this -> input -> post('email');
    $login_id = $this -> db -> query("SELECT var_userrole FROM tbl_login where var_email = '" . $email . "'");
    return  $login_id -> row_array();
}

public function login_session() {
    $email = $this -> input -> post('email');
    $login_id = $this -> db -> query("SELECT var_userrole FROM tbl_login where var_email = '" . $email . "'");
      //$row =  $login_id -> row() // as object return $row->var_userrole;
      $row =  $login_id -> row_array();
    return $row['var_userrole']
}

---

如果在此之前您正在为auth开发新的东西，请检查CI中的一些auth系统，如ion_auth拥有您可以管理的组，并检查用户属于哪个组

以及问题是什么？？问题到底是什么@bipen和Distinct：我是CodeIgniter的初学者。在查看用户指南后，无法设置会话。没有错误，但不工作！我想知道我对控制器会话代码所做的操作是否正确？非常感谢你的时间。如果代码不正确，请指出正确的方法。我们无法帮助您，因为我们看不到任何问题，代码到底出了什么问题？