多态-II（接口实现）

2022-12-30 18:53:02

<!DOCTYPE html>

<html>

	<head>

		<meta charset="utf-8">

		<title>多态类</title>

	</head>

	<body>

		<?php

			interface Car{

				public function say();

			}

			class Bus implements Car{

				public function say(){

					echo "公交车"."<br>";

				}

			}

			class Taxi implements Car{

				public function say(){

					echo "出租车"."<br>";

				}

			}

			function say($obj){

				if($obj instanceof Car){

					$obj->say();

				}

			}

			$bus=new Bus();

			$taxi=new Taxi();

			say($bus);	//输出“公交车”

			say($taxi);	//输出“出租车”

		?>

	</body>

</html>

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