这种怎么完整写出来求大神指教

$key='123456789';//双方约定并保密
$time = time();
$token = md5($key.$time);
$data = file_get_contents("http://www.baidu.com/api/api.php?time=".$time."&token=".$token);
$result = json_decode($data, true);

if($result['success']){
	echo 'success';
}else{
	echo 'fail';
}

$time = isset($_GET['time'])? $_GET['time'] : '';
$token= isset($_GET['token'])? $_GET['token'] : '';
$key = '123456789';//与上面保持一样

$ret = array();

if(md5($key.$time)==$token){
	$ret['success'] = true;
}else{
	$ret['success'] = false;
}

header('content-type:application/json;charset=utf8');

echo json_encode($ret);