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.

I don't understand. If you want do something on start, create a init() function. — joaner
– joaner, Commented Aug 2, 2015 at 13:00
@joaner I realize in theory they are both one and the same with their functionality but how can I do it using __construct. — Zack
– Zack, Commented Aug 2, 2015 at 13:06

Estus Flask · Accepted Answer · 2015-08-02 18:10:41Z

9

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.

answered Aug 2, 2015 at 18:10

Estus Flask

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Comments

Abdallah Elsabeeh · Accepted Answer · 2019-12-26 11:43:24Z

2

in yii2 you can use init function rather than constructor function

It's recommended to use init(), you can found it a lot in the extensions, but in some cases, you should use __construct(). you can find it here.

construct runs on a new instance, and then it calls the init() function which calls all the default values and functions in the class to set. so using init() is more easily and safely and do the same work as __construct() function

 public function init() {
    your code
}

edited Dec 26, 2019 at 11:43

answered Dec 24, 2019 at 11:57

Abdallah Elsabeeh

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3 Comments

RyanNerd Over a year ago

While this answer may be correct. Code only answers are rarely helpful. Please comment your code and provide an explanation for how this code solves the problem.

Abdallah Elsabeeh Over a year ago

thanks i add more informations about init() function what it used for and why we should use it rather than the constructor function

Chlind Over a year ago

Vote up, because with explanation, your answer is actually helpful.

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