How to use traits in Laravel 5.4.18? - php

Question

I need an example of where to exactly create the file, to write to it, and how to use the functions declared in the trait. I use Laravel Framework 5.4.18
-I have not altered any folder in the framework, everything is where it corresponds-
From already thank you very much.

Answer 1

I have Create a Traits directory in my Http directory with a Trait called BrandsTrait.php
and use it like:
use App\Http\Traits\BrandsTrait;
class YourController extends Controller {
use BrandsTrait;
public function addProduct() {
//$brands = Brand::all();
// $brands = $this->BrandsTrait(); // this is wrong
$brands = $this->brandsAll();
}
}
Here is my BrandsTrait.php
<?php
namespace App\Http\Traits;
use App\Brand;
trait BrandsTrait {
public function brandsAll() {
// Get all the brands from the Brands Table.
$brands = Brand::all();
return $brands;
}
}
Note: Just like a normal function written in a certain namespace, you can use traits as well

Answer 2

Trait description:
Traits are a mechanism for code reuse in single inheritance languages such as PHP. A Trait is intended to reduce some limitations of single inheritance by enabling a developer to reuse sets of methods freely in several independent classes living in different class hierarchies. The semantics of the combination of Traits and classes is defined in a way which reduces complexity and avoids the typical problems associated with multiple inheritance and Mixins.
The solution
Make a directory in your App, named Traits
Create your own trait in Traits directory ( file: Sample.php ):
<?php
namespace App\Traits;
trait Sample
{
function testMethod()
{
echo 'test method';
}
}
Then use it in your own controller:
<?php
namespace App\Http\Controllers;
use App\Traits\Sample;
class MyController {
use Sample;
}
Now the MyController class has the testMethod method inside.
You can change the behavior of trait methods by overriding them it in MyController class:
<?php
namespace App\Http\Controllers;
use App\Traits\Sample;
class MyController {
use Sample;
function testMethod()
{
echo 'new test method';
}
}

Answer 3

Let's look at an example trait:
namespace App\Traits;
trait SampleTrait
{
public function addTwoNumbers($a,$b)
{
$c=$a+$b;
echo $c;
dd($this)
}
}
Then in another class, just import the trait and use the function with this as if that function was in the local scope of that class:
<?php
namespace App\ExampleCode;
use App\Traits\SampleTrait;
class JustAClass
{
use SampleTrait;
public function __construct()
{
$this->addTwoNumbers(5,10);
}
}