How to use Trait in Interface PHP?

Today I will tell you how you can use trait in interface php? First of all, you create an php file, add codes. Then run codes on the server show results. Example

<?php
class Base {
    public function sayHello() {
        echo 'Experts';
    }
}
trait SayWorld {
    public function sayHello() {
        parent::sayHello();
        echo 'PHP';
    }
}
class MyHelloWorld extends Base {
    use SayWorld;
}
$e = new MyHelloWorld();
$e->sayHello();
?>