php 神奇的trait 1

<?php
trait demo{
public $name;
private $old;
protected $pp;

function set(){
echo “成员方法”;
}
abstract function abdemo();
}

class demo1{
use demo;
function abdemo(){
echo “必须实现抽象方法”;
}
}

$demo1 = new demo1();
$demo1 -> set();