constructor - CodeIgniter

Question

Can anyone tell me why is the constructor in controller code using parent::__construct ? I only know it is because this is to use the method in parent class which is within CI_Controller. If so, why is the constructor in model code not using parent::__construct?

class News extends CI_Controller
{

public function __construct()
{
    parent::__construct();
    $this->load->model('news_model');
} 



class News_model extends CI_Model
{
public function __construct()
{
    $this->load->database();
}

You need to call the constructor of the parent, because if you don't you can't use any of the properties like 'load'. — Mubashar Abbas, Aug 06 '15 at 07:19
[FOR you information we can use ` parent::__construct` in model file too](http://www.codeigniter.com/user_guide/general/models.html?highlight=models) — Saty, Aug 06 '15 at 07:22

score 0 · Accepted Answer · edited May 23 '17 at 12:22

The reason this line is necessary is because your local constructor will be overriding the one in the parent controller class so we need to manually call it.

Constructors are useful if you need to set some default values, or run a default process when your class is instantiated. Constructors can't return a value, but they can do some default work.

Read Codeigniter Constructors

And Possible Duplicate of PHP Codeigniter - parent::__construct

Example

public function  __construct()
{
    parent::__construct();
    $this->load->helper('date');
    $this->load->library('session');
    $this->load->model('My_model');
    $this->load->library('cart');

}

score 0 · Answer 2 · answered Jun 23 '17 at 16:37

you need to include parent::__construct(); to include the extended class default constructor initialization of codeigniter if you don't include that you will override the parent class constructor. function __construct() always run when the class is instantiate, so if you want to load some libraries or initialize some value its good to put it there.

constructor - CodeIgniter

2 Answers2