[英]Undefined variable in the template
每当加载控制器时,我都会得到未定义的变量。
这是被调用的控制器的索引函数(第4行),并且每隔一次出现相同的错误。
<?php
class Students extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->model('Student_model');
}
public function index() {
$data['view_name'] = 'students/dashboard';
$this->load->view('templates/template_student' , $data );
}
}
模板中错误的出处这是template_student模板中代码的一部分
<ul class="nav navbar-nav navbar-right">
<li class="">
<a href="javascript:;" class="user-profile dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
<?php if ($student->passport_photo == '') { ?>
<img src="<?php echo base_url(); ?>assets/images/sample.jpg" alt="">
<?php } else { ?>
<img src="<?php echo base_url(); ?><?php echo $student->passport_photo; ?>" alt="">
<?php } ?>
<?php if ($this->session->userdata('logged_in')) : ?>
<?php echo $this->session->userdata('first_name') . " " . $this->session->userdata('last_name'); ?>
<?php endif; ?>
<span class=" fa fa-angle-down"></span>
</a>
<ul class="dropdown-menu dropdown-usermenu pull-right">
<li><a href="<?php echo base_url(); ?>students/profile"> Profile</a>
</li>
<li><a href="<?php echo base_url(); ?>students/logout"><i class="fa fa-sign-out pull-right"></i> Log Out</a>
</li>
</ul>
</li>
</ul>
我做错了什么?
您已经在控制器中加载了一个名为Student的模型,并且在模板中正在访问$ student变量。 那是两件事。
您应该执行以下操作:
class Students extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->model('Student_model', 'student');
}
public function index()
{
$student = ... // retrieve the student from db
$data['student'] = $student; // define the variable to be sent to the view
$this->load->view('templates/template_student' , $data );
}
}
控制器变更
<?php
class Students extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->model('Student_model');
}
public function index() {
$data = array();
$data['view_name'] = 'students/dashboard';
$data['student'] = $this->student_model->get_all();
$this->load->view('templates/template_student' , $data );
}
}
然后,您必须在Student_model类中添加get_all()函数,如下所示
function get_all()
{
$this->db->from($this->table);
$query=$this->db->get();
if($query->num_rows()>0){
return $query->result_array();
}
else{
return array();
}
}
$this->table
应该是students表名
现在,我希望您可以在视图中检查“ passport_photo”值是否存在
<?php if($student[0]['passport_photo'] == ''){
.
.
.
} ?>
希望对您有帮助。。谢谢!
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