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

talk();

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

}

$teacher=new Teacher;
testtalk($teacher);
echo "
\n";
testplay($teacher);
echo "
\n";

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

运行结果

task4.jpg