我正在开发一个社交网络应用程序 . 我正面临一个问题,我试图从我的数据库中名为users的表中获取名称和用户名 . 为了能够在不单独访问所有控制器的情况下执行此操作,我必须创建名为MY_Controller的Core控制器 .
这是问题(没有公共$ users的MY_Controller):
<?php
class MY_Controller extends CI_Controller
{
//public $users = array('username' => $this->input->post('username'));
function __construct()
{
parent::__construct();
//Get user data to make it available for both Admin and Public Controllers
$this->load->model('User_model');
$this->users = $this->User_model->get_list();
//Load Menu Library
$this->load->library('menu');
$this->pages = $this->menu->get_pages();
// Brand/Logo
$this->favicon = 'https://blogpersonal.net/wp-content/uploads/2017/08/favicon-v2-150x150.png';
$this->brand = 'Some Name';
$this->description = 'Some Description';
$this->credits = 'https://blogpersonal.net/';
$this->version = '1.1.1';
}
}
class Admin_Controller extends MY_Controller
{
function __construct()
{
parent::__construct();
if (!$this->session->is_admin) {
redirect('admin/login');
}
//some code here
}
}
class Public_Controller extends MY_Controller{
function __construct(){
parent::__construct();
//some code here
}
}
class Social_Controller extends MY_Controller
{
function __construct()
{
parent::__construct();
if (!$this->session->is_member) {
redirect('dashboard/login');
}
//some code here
}
}
如您所见,我使用__construct函数加载User_model以使其可用并在所有控制器中使用它 .
我想在名为templates的文件夹中获取数据 . views>templates>any document 但是当我尝试在这样的视图中获取它时:
<?php if($this->users) : ?>
<li class="dropdown user user-menu">
<!-- Menu Toggle Button -->
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
<!-- The user image in the navbar-->
<img src="<?php echo base_url(); ?>assets/img/user2-160x160.jpg" class="user-image" alt="User Image">
<!-- hidden-xs hides the username on small devices so only the image appears. -->
<span class="hidden-xs"><?php echo $this->users['username']; ?></span>
</a>
</li>
<?php endif; ?>
THIS IS THE OLD ERROR . 它告诉我一个错误 . 难道我做错了什么?有人可以解释我如何解决它 . 这是我第一次无法获取数据 . 这是我得到的结果:
遇到PHP错误严重性:通知消息:未定义变量:users文件名:Templates / public.php行号:161 Backtrace:文件:C:\ xampp \ htdocs \ codeigniter \ application \ views \ Templates \ public.php行: 161函数:_error_handler文件:C:\ xampp \ htdocs \ codeigniter \ application \ libraries \ Template.php行:34函数:视图文件:C:\ xampp \ htdocs \ codeigniter \ application \ controllers \ Pages.php行:12函数:load文件:C:\ xampp \ htdocs \ codeigniter \ index.php行:315函数:require_once
这是我的模型(User_model),以防您可能需要它:
<?php
class User_model extends CI_MODEL
{
function __construct()
{
parent::__construct();
$this->table = 'users';
}
public function get_list()
{
$query = $this->db->get($this->table);
return $query->result();
}
public function get($id)
{
$this->db->where('id', $id);
$query = $this->db->get($this->table);
return $query->row();
}
public function add($data)
{
$this->db->insert($this->table, $data);
}
public function update($id, $data)
{
$this->db->where('id', $id);
$this->db->update($this->table, $data);
}
public function delete($id)
{
$this->db->where('id', $id);
$this->db->delete($this->table);
}
public function login($username, $password)
{
$this->db->select('*');
$this->db->from($this->table);
$this->db->where('username', $username);
$this->db->where('password', $password);
$this->db->limit(1);
$query = $this->db->get();
if ($query->num_rows() == 1) {
return $query->row()->id;
} else {
return false;
}
}
}
现在有了我建议的更改,它现在显示一个新错误:
The New error:
遇到PHP错误严重性:通知消息:未定义索引:用户名文件名:Templates / public.php行号:168 Backtrace:文件:C:\ xampp \ htdocs \ codeigniter \ application \ views \ Templates \ public.php行: 168函数:_error_handler文件:C:\ xampp \ htdocs \ codeigniter \ application \ libraries \ Template.php行:34函数:视图文件:C:\ xampp \ htdocs \ codeigniter \ application \ controllers \ public \ Dashboard.php行: 13功能:加载文件:C:\ xampp \ htdocs \ codeigniter \ index.php行:315功能:require_once
现在,如果取消注释Core控制器(MY_Controller)中的公共$用户,它也会显示一个新错误:
New error with public $users out of __construct function
致命错误:常量表达式在第6行的C:\ xampp \ htdocs \ codeigniter \ application \ core \ MY_Controller.php中包含无效操作遇到PHP错误严重性:编译错误消息:常量表达式包含无效操作文件名:core / MY_Controller .php行号:6 Backtrace:
这是我想要获取数据的图片:
难道我做错了什么?谢谢你的帮助 .
这是视图(public.php)文件:
<ul class="nav navbar-nav">
<?php if(!$this->session->is_member) : ?>
<li><?php echo anchor('public/users/login', 'Login'); ?></li>
<li><?php echo anchor('public/users/register', 'Register'); ?></li>
<?php else : ?>
<!-- Messages: style can be found in dropdown.less-->
<li class="dropdown messages-menu">
<!-- Menu toggle button -->
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
<i class="fa fa-envelope-o"></i>
<span class="label label-success">4</span>
</a>
<ul class="dropdown-menu">
<li class="header">You have 4 messages</li>
<li>
<!-- inner menu: contains the messages -->
<ul class="menu">
<li><!-- start message -->
<a href="#">
<div class="pull-left">
<!-- User Image -->
<img src="<?php echo base_url(); ?>assets/img/user2-160x160.jpg" class="img-circle" alt="User Image">
</div>
<!-- Message title and timestamp -->
<h4>
Support Team
<small><i class="fa fa-clock-o"></i> 5 mins</small>
</h4>
<!-- The message -->
<p>Why not buy a new awesome theme?</p>
</a>
</li>
<!-- end message -->
</ul>
<!-- /.menu -->
</li>
<li class="footer"><a href="#">See All Messages</a></li>
</ul>
</li>
<!-- /.messages-menu -->
<!-- Notifications Menu -->
<li class="dropdown notifications-menu">
<!-- Menu toggle button -->
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
<i class="fa fa-bell-o"></i>
<span class="label label-warning">10</span>
</a>
<ul class="dropdown-menu">
<li class="header">You have 10 notifications</li>
<li>
<!-- Inner Menu: contains the notifications -->
<ul class="menu">
<li><!-- start notification -->
<a href="#">
<i class="fa fa-users text-aqua"></i> 5 new members joined today
</a>
</li>
<!-- end notification -->
</ul>
</li>
<li class="footer"><a href="#">View all</a></li>
</ul>
</li>
<!-- Tasks Menu -->
<li class="dropdown tasks-menu">
<!-- Menu Toggle Button -->
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
<i class="fa fa-flag-o"></i>
<span class="label label-danger">9</span>
</a>
<ul class="dropdown-menu">
<li class="header">You have 9 tasks</li>
<li>
<!-- Inner menu: contains the tasks -->
<ul class="menu">
<li><!-- Task item -->
<a href="#">
<!-- Task title and progress text -->
<h3>
Design some buttons
<small class="pull-right">20%</small>
</h3>
<!-- The progress bar -->
<div class="progress xs">
<!-- Change the css width attribute to simulate progress -->
<div class="progress-bar progress-bar-aqua" style="width: 20%" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100">
<span class="sr-only">20% Complete</span>
</div>
</div>
</a>
</li>
<!-- end task item -->
</ul>
</li>
<li class="footer">
<a href="#">View all tasks</a>
</li>
</ul>
</li>
<!-- User Account Menu -->
<?php if($this->users) : ?>
<li class="dropdown user user-menu">
<!-- Menu Toggle Button -->
<a href="#" class="dropdown-toggle" data-toggle="dropdown">
<!-- The user image in the navbar-->
<img src="<?php echo base_url(); ?>assets/img/user2-160x160.jpg" class="user-image" alt="User Image">
<!-- hidden-xs hides the username on small devices so only the image appears. -->
<span class="hidden-xs"><?php echo $this->users['username']; ?></span>
</a>
<ul class="dropdown-menu">
<!-- The user image in the menu -->
<li class="user-header">
<img src="<?php echo base_url(); ?>assets/img/user2-160x160.jpg" class="img-circle" alt="User Image">
<p><?php echo $this->users['name']; ?> - Web Developer<small>Member since Nov. 2012</small></p>
</li>
<!-- Menu Body -->
<li class="user-body">
<div class="row">
<div class="col-xs-4 text-center">
<a href="#">Followers</a>
</div>
<div class="col-xs-4 text-center">
<a href="#">Sales</a>
</div>
<div class="col-xs-4 text-center">
<a href="#">Friends</a>
</div>
</div>
<!-- /.row -->
</li>
<!-- Menu Footer-->
<li class="user-footer">
<div class="pull-left">
<a href="#" class="btn btn-default btn-flat">Profile</a>
</div>
<div class="pull-right">
<a href="<?php echo base_url(); ?>public/users/logout" class="btn btn-default btn-flat">Sign out</a>
</div>
</li>
</ul>
</li>
<?php endif; ?>
<li>
<a href="#" data-toggle="control-sidebar"><i class="fa fa-gears"></i></a>
</li>
<?php endif; ?>
</ul>
2 回答
你现在有这个......我只在这里展示片段......
有人建议您将本地定义的$ data ['users']转换为 "Property"
所以我们现在有两个变化......
1声明属性
2设置属性 .
现在,扩展MY_Controller的所有控制器现在都可以访问在MY_Controller中创建的$ this-> users ...
所以你引用 $this->users 你想要使用它 .
我建议你先阅读类,属性,方法和继承 . 通常这足以让你变得危险 . 它需要一点点习惯,但值得努力......
Update: 在调用View的控制器中,您将执行$ data ['users'] = $ this-> users;
在您看来,您现在将它称为$ users-> field_name,就像之前一样 . 我们所做的就是在您的基类中定义$ users,现在可以作为$ this-> users访问,因此所有扩展MY_Controller类的控制器/方法都可以访问它们 .
你现在有这个 .
你应该使用$ this-> data ['users']来代替$ data
加载视图时,请使用下面的代码
它将显示存储在父类构造函数中的所有变量(在视图中)