Question

我不知道上面的标题是否是关于我的问题的正确标题。

有没有办法声明一个变量，我们可以从视图中的任何地方访问它，而无需在控制器的每个函数中再次重新定义它？

例如在控制器文件中，Students.php包含许多处理视图的函数，请看下面的内容：

public function __construct() {
  parent::__construct();
  $data['count_student'] = $this->m_data->allStudent(); // count all students
}

public function index() {
  $data['content'] = 'view-students';
  $this->load->view('frontend/header' , $data);
}

public function showDetails() {
      $data['content'] = 'view-detail-students';
      $this->load->view('frontend/header' , $data);
}

我希望我们可以访问$count_student和view-students.php中的view-detail-student.php，而无需在处理视图的每个函数上定义$data['count_student'] = $this->m_data->allStudent();。

有可能这样做吗？

Answer 1

在application / core / create MY_Controller.php

中

<?php 

class MY_Controller extends CI_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->model('m_data');
        $this->data['count_student'] = $this->m_data->allStudent();
    }

}

控制器使用$this->data

class Students extends MY_Controller {

    public function __construct() {
        parent::__construct();
    }

    public function index() {
      $this->data['content'] = 'view-students';
      $this->load->view('frontend/header', $this->data);
    }

    public function showDetails() {
        $this->data['content'] = 'view-detail-students';
        $this->load->view('frontend/header', $this->data);
    }
}

现在您已经扩展了控制器，您可以像

一样

<?php echo $count_student;?>

在视图

上

Answer 2

如果在每个控制器功能中使用相同的变量，则必须按如下方式声明

class Example extends CI_Controller{
protected $data = array();

public function __construct() {
  parent::__construct();
  $this->data['count_student'] = $this->m_data->allStudent();
}

public function index() {
  $this->data['content'] = 'view-students'; //variables are same
  $this->load->view('frontend/header' , $this->data);
}

public function showDetails() {
      $this->data['content'] = 'view-detail-students'; //variables are same
      $this->load->view('frontend/header' , $this->data);
}

}

仅当此控制器中的所有视图都有公共变量时才适用。如果您使用的是不同的变量，请使用以下代码。

class Example extends CI_Controller{
    protected $count_student= "";

public function __construct() {
  parent::__construct();
  $this->count_student = $this->m_data->allStudent();
}

public function index() {
  $data['content'] = 'view-students'; //Variable is different
  $data['count_student'] = $this->count_students;
  $this->load->view('frontend/header' , $data);
}

public function showDetails() {
      $data['details'] = 'view-detail-students'; // Variable is different
      $data['count_student'] = $this->count_students;
      $this->load->view('frontend/header' , $data);
}

}

Answer 3

我注意到，如果在控制器中使用$this->声明变量，则可以在视图中访问变量而不传递变量。可能是因为他们默认公开可见度。

 public function __construct() {
   parent::__construct();
   // $data['count_student'] = $this->m_data->allStudent(); // count all students
   // 
   $this->count_all_the_students = $this->m_data->allStudents();

 }

 public function index() {
   $data['content'] = 'view-students';
   $this->load->view('frontend/header' , $data);
 }

然后在视图中，您可以使用$this->count_all_the_students而不将其放在$ data数组中。

 <?php defined('BASEPATH') OR exit('No direct script access allowed'); ?>

 <?php 
   echo 'I have misled ' . $this->count_all_the_students . ' students with my MVC breaking suggestions.';

Codeigniter全局变量在视图中

3 个答案: