php_task4

任务：

定义接口
iTalkable 具有⽅法 talk()
定义接口 iPlayable
具有⽅法 play()
定义抽象类 People，实现上述两个接口
定义类 Teacher 继承⾃People

解决方案

<?php

interface iTalkable{
    public function talk();
}
interface iPlayable{
    public function play();
}
abstract  class People implements iTalkable,iPlayable
{
    abstract public function talk();
    abstract public function play();
}
class Teacher extends People
{
    public function talk()
    {
        echo "i talk";
    }

    public function play()
    {
        echo "i play";
    }
}
function testtalk(iTalkable $talk)
{
    $talk->talk();

}
function testplay(iPlayable $play)
{
    $play->play();

}

$teacher=new Teacher;
testtalk($teacher);
echo "</br>\n";
testplay($teacher);
echo "</br>\n";

var_dump($teacher instanceof Teacher);
echo "</br>";
var_dump($teacher instanceof People);
echo "</br>";
var_dump($teacher instanceof iTalkable);
echo "</br>";
?>

运行结果

task4.jpg