调用控制器的 Laravel 索引函数时的自动调用函数

Question

I have a controller class as follows:

class Controller extends BaseController{

protected function function1()
{
    //code
}

protected function function2()
{
     //code
}
}

and every controller in the project extends this class such that i can write functions used in multiple controllers in this Controller class.

class RandomController extends Controller{

    public function aCertainFunction()
    {
        $this->function1();
        //code 
    {
}

I now have a function that should be called every time the index function of any controller is called. One option is that i manually add this function at the start of every index function in the controllers i have and that i keep doing this for every new controller i create in the future but this doesn't seem efficient to me.

Is there a way to define this function in my Controller class such that every index function in all classes that inherit from this class will automatically call this function?

Answer 1

You should definitely take a look at the Events Listening system embedded in the Laravel framework. Let's admit that you want to trigger aCertainFunction() every time function1 or function2 is executed.

You'll have to declare an Event class which will be stored into the namespace App\\Events; (you don't need to extends Controller at all as it is dedicated to another purpose).

The public handle function of your Event class will be called to be executed when you trigger the event with the event() function. Therefore you will declare your aCertainFunction function directly inside your event class (and call it from the handle function). Please take a deep look at How Laravel is handling Events as it is really dedicated to delegate and call them on specific purposes (and that's why we call them "listeners").