PHP ThinkPHP Collection对象如何高效转换为数组？

object(thinkcollection)#117 (1) {  ["items":protected] => array(10) {    [0] => array(5) {      ["id"] => int(2)      ["post_id"] => int(7)      ["category_id"] => int(9)      ["list_order"] => float(10000)      ["status"] => int(1)    }    [1] => array(5) {      ["id"] => int(3)      ["post_id"] => int(8)      ["category_id"] => int(9)      ["list_order"] => float(10000)      ["status"] => int(1)    }    ...  }}

$array = $data->toarray();

var_dump($array);