语法错误，codeigniter中出现意外的“protected”(T_PROTECTED)

Question

Admin_controller

<?php
class Admin_controller extends CI_Controller{
    function __construct()
    {
        parent::__construct();
        $this->load->model("Adminmodel","",true);
        
        protected $headerview = 'headerview';
        protected function render($content) { 
            //$view_data = array( 'content' => $content);
            $this->load->view($this->headerview);
        }
     }
}
?>

我想在应用程序的所有页面中访问我的headerview.php，这样我就像上面一样创建了，但它显示了像Parse error: syntax error, unexpected 'protected' (T_PROTECTED) in C:\xampp\htdocs\ci3\application\controllers\admin\Admin_controller.php一样的错误。如何解决这个问题？

Answer 1

没有方法可以在中创建函数

class Admin_controller extends CI_Controller{
    function __construct()
    {
        parent::__construct();
        $this->load->model("Adminmodel","",true);

        $headerview = 'headerview';
        $this->render($headerview); # calling render() function in same class

    }

    function render($content) 
    { 
        //$view_data = array( 'content' => $content);
        $this->load->view($this->headerview);
    }
}

Answer 2

你不应该假设在带有访问修饰符的构造器中创建/声明一个函数，否则它会像你一样抛出一个错误。您可以创建匿名函数或普通函数声明，请考虑以下内容：

class Student {

  public function __construct() {

    // below code will run successfull
    function doingTask () {
       echo "hey";    
    }
    doingTask();

    // but this will throw an error because of declaring using access modifier
    public function doingTask () {
       echo "hey";    
    }
  }
}

$std = new Student;