如何在 PHP Codeigniter 中使用全局变量

How to use global variable in PHP Codeigniter

提问by user385729

I have implemented the login logic in an MVC application; I want to see if the user has filled the username and passowrd incorrectly and if so I want to show a notifictaion in the view; so I'm passing this information via $data['er']; but for some reason it is not catching this data:

我已经在 MVC 应用程序中实现了登录逻辑；我想看看用户是否错误地填写了用户名和密码，如果是，我想在视图中显示一个通知；所以我通过 $data['er'] 传递这些信息；但由于某种原因，它没有捕捉到这些数据：

Please let me know if my question is clear or not; and if any clarification is needed, please let me know which part is ambiguous

请让我知道我的问题是否清楚；如果需要任何澄清，请让我知道哪个部分不明确

My code:

我的代码：

class Login extends CI_Controller {

    public function __construct() {
        parent::__construct();
         $GLOBALS['er'] = False;
    }



    public function index() {

        $data['er']=$GLOBALS['er'];
        $data['main_content'] = 'login_form';
        $this->load->view('includes/template', $data);
    }

    public function validate_credentials() {

        $this->load->model('user_model');
        $query = $this->user_model->validate();
        if ($query) {
            $data = array(
                'username' => $this->input->post('username'),
            );
            $this->session->set_userdata($data);
            redirect('project/members_area');
        } else {
            $GLOBALS['er'] = TRUE;
            $this->index();

        }
    }

} 

回答by doitlikejustin

Don't use GLOBALSyou can just use a private variable in your class.

不要使用，GLOBALS您可以在类中使用私有变量。

• Create the variable above your __constructfunction like private $er
• In your __contructfunction set the default value
• Set and get in your public function using $this->er

• 在__construct函数上方创建变量，例如private $er
• 在您的__contruct函数中设置默认值
• 设置并使用您的公共功能 $this->er

Implemented in your code:

在您的代码中实现：

class Login extends CI_Controller {

    private $er;

    public function __construct() {
        parent::__construct();
        $this->er = FALSE;
    }

    public function index() {
        $data['er']= $this->er;
        $data['main_content'] = 'login_form';
        $this->load->view('includes/template', $data);
    }

    public function validate_credentials() {
        $this->load->model('user_model');
        $query = $this->user_model->validate();
        if ($query) {
            $data = array(
                'username' => $this->input->post('username'),
            );
            $this->session->set_userdata($data);
            redirect('pmpBulletin/members_area');
            //die(here);
        } else {
            $this->er = TRUE;
            $this->index();
        }
    }
}