领悟php接口中interface存在的意义

复制代码 代码如下:

interface Ipay
{
function withmoney();

//function withinternet();
}
class Dmeng implements Ipay
{

function withmoney()
{
echo "花人民币买东西";
}
function withinternet()
{
return "用网银支付";
}
}

复制代码 代码如下:

include_once 'pay.php';
class main
{
function run($vc)
{
$this->vc = $vc;
$this->vc->withinternet();
echo "yunxing";
}

}
$com= new main();
$com->run(new Dmeng);