How to solve Creating default object from empty value?

Question

I found something about this error but I think this is little bit different. I defined a public variable.

Class Controller{    
    public $model;

And I'm trying add extra word(model) between $model_name and $this.

public function call_model($model_name){
$this->model->$model_name = new $model_class;

What is the solution?

EDIT:

Warning: Creating default object from empty value in C:\xampp\htdocs\alisveris\project_library\Controller.php on line 16

What? If you want to have a property $model that has properties itself, it needs to be a object itself — kero
– kero, Commented Dec 22, 2013 at 14:16
what does the $model_class variable contains? It seems to me that it is empty, and therefore you are getting that error. — GermanK
– GermanK, Commented Dec 22, 2013 at 14:34

P.W-S · Accepted Answer · 2013-12-22 14:31:09Z

1

You can create static factory method to create different models like this:

abstract class Model {
 static function CallModel($name) {
  switch ( $name ) {
   case 'Naomi': return new NaomiCampbell();
   case 'Anja': return new AnjaRubik();
   default: return new $name;
  }
 }
}

class NaomiCampell extends Model {}
class AnjaRubik extends Model {}

Then use:

$MyModel = Model::CallModel($name);

answered Dec 22, 2013 at 14:31

P.W-S

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Comments

Hmmm · Accepted Answer · 2013-12-22 14:39:10Z

0

You can do it by assigning $model variable to $this

 class Db
  {
         public function great()
         {
             echo 'great';
         }
  }


 class Controller{

     public $model;

     public function __construct()
     {
         $this->model = $this;

         $model_name = 'Db';
         $this->model->$model_name = new $model_name;

     }
 }

 $cc = new Controller();

 echo $cc->model->Db->great();

Output

great

answered Dec 22, 2013 at 14:39

Hmmm

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