php中遇到的，这是什么，第一次遇到，怎样取其值？多谢

echo {xx[items]->item}[0];[title]

echo {xx[items]->item}[0][num];

echo {xx[items]->item}[0][title];

echo {xx[items]->item}[0][num];

foreach($arr['items']->item as $v)

{

    echo $v->num. ' ' .$v->title."\n";

}

foreach ($arr['items'] as $k=> $v) {

	$title = $v[0]['title'];

	$num = $v[0]['num'];

	//插入数据库

}

?>