PHP中的加强型接口Traits

trait Hello
{
    private $name = ‘chenqionghe‘;
    public function sayHello()
    {
        echo ‘hello ‘;
    }
}
trait World
{
    public $age = ‘18‘;
    public function sayWorld()
    {
        echo ‘world ! ‘;
    }
}
class HandsonBoy
{
    use Hello,World;
    public function say()
    {
        echo ‘i am ‘.$this->name;
    }
}
$boy = new HandSonBoy();
$boy->sayHello();
$boy->sayWorld();
echo $boy->say();