Yii2: How can I create constructor in a controller?

Question

How can I create a constructor in a Yii2 controller? I am trying to find out what exactly is the $id $module and $config = [] in the parent::__construct arguments.

public function __construct($id, $module, $config = [])
{
    $this->id = $id;
    $this->module = $module;
    parent::__construct($config);
}

I would appreciate a working example.

Answer 1

There shouldn't be anything wrong with

public function __construct($id, $module, $config = [])
{
    \yii\helpers\VarDumper::dump([$id, $module, $config]);
    parent::__construct($id, $module, $config);
}

if the goal is to investigate what happens there.

For production it is better to stick to overriding init method and use $this->id and $this->module there if needed. That's where the framework expects initialization code to be placed:

It is recommended that you perform object initialization in the init() method because at that stage, the object configuration is already applied.