如何在Codeigniter中将父类构造函数访问子类

Question

parent class

class Main {
          private $ci;
            public function __construct()
    {      
             $this ->ci=& get_instance();
             $this ->ci->load->database();
    }
}

child class

   class Commonlib extends main { 

    public function __construct()
    {      
              parent::__construct();
    }
       function getcountries(){
             $this->db->from($this->countries);
             $this->db->order_by("country", "ASC");
             $query = $this->db->get(); 
             return $query->result();

        }
}

i want to access parent constructor variable in child class as child class i use db variable how to access

i want to implement this code show this error

Fatal error: Class 'main' not found

Answer 1

As per class inheritance you should be able to do something similar to parent:: __construct .

As for the error of class class main not found ensure the child class has the correct use statement at the beginning and the autoloader array map has class main mapped.

http://php.net/manual/en/language.oop5.decon.php http://php.net/manual/en/language.oop5.autoload.php