<?php
// interface 多繼承
class Base{
    public function sayHello(){
        echo "hello";
    }
}
trait SayWorld{
    public function sayHello(){
        parent::sayHello();
        echo "world";
    }
}
trait SayWorld2{
    public function sayHello2(){
        echo "PHP";
    }
}
class  MyHelloWorld
 
 extends Base{
    use SayWorld,SayWorld2;
}
$s = new MyHelloWorld();
$s->sayHello();
$s->sayHello2();