Method with same name called from Interface not from Trait?

Question

I have created same method printData() in the MyInterface.php and MyTrait.php and i am calling the method printData() from my controller which implements the MyInterface.php and use MyTrait.php. But the method is always calling from MyInterface.php. Please explain it why this occurs?

MyInterface.php

<?php namespace App\Interfaces;

interface MyInterface
{
    public function printData();
}

MyTrait.php

<?php namespace App\Traits;

trait MyTrait
{
    public function printData()
    {
        dd("From Trait");
    }
}

HomeController.php

<?php namespace App\Http\Controllers;

use App\Interfaces\MyInterface;
use App\Traits\MyTrait;
use App\User;

class HomeController extends Controller implements MyInterface
{
    use MyTrait;

    public function index()
    {
        $this->printData();
    }

    public function printData() {
        // TODO: Implement printData() method.
        dd("From Interface");
    }
}

There's no way this code would work normally. Chances are you need to add use App\Traits\MyTrait to see the result — apokryfos
– apokryfos, Commented Oct 30, 2017 at 12:38
Methods in a class always take precedence over a method imported from a trait. See the section on precedence in the manual. — iainn
– iainn, Commented Oct 30, 2017 at 12:40
Do you actually need both implementations in your class? The quickest fix for this is probably to just remove the printData method from your class, since they it will always use the version from the trait. It will still be considered to implement the interface, if that's a concern in other parts of your code. — iainn
– iainn, Commented Oct 30, 2017 at 12:59

mega6382 · Accepted Answer · 2017-11-03 08:15:55Z

6

Try using it like this:

class HomeController extends Controller implements MyInterface
{
    use MyTrait{
        printData as MyTraitPrintData;
    }

    public function index()
    {
        $this->MyTraitPrintData();
    }

    public function printData()
    {

        dd("From Interface");
    }
}

Traits are meant to provide reusable methods and properties. They will not override the class's own methods. By defining printData() inside the HomeController you are actually overriding the printData() inside MyTrait. That is why you have to differentiate them from each other.

Learn more about all this in Horizontal Reuse for PHP

edited Nov 3, 2017 at 8:15

answered Oct 30, 2017 at 12:41

mega6382

9,39217 gold badges52 silver badges73 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Lloople · Accepted Answer · 2017-10-30 12:38:45Z

1

The method is not calling from MyInterface but from HomeController.

The reason is because HomeController acquires the method from the trait MyTrait but then overrides it.

If you want that method in your trait, you don't need to declare an interface.

What interfaces do is forcing the classes which implements it to declare those methods, but you don't want to do that since you're creating the method in a Trait..

answered Oct 30, 2017 at 12:38

Lloople

1,8241 gold badge17 silver badges32 bronze badges

Collectives™ on Stack Overflow

Method with same name called from Interface not from Trait?

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related