Question

如何获取foreach中下一个ORM元素的值？我需要这样的东西：

   $users = ORM::factory('Users')
       ->order_by('category', 'ASC')
       ->find_all();
    foreach($users as $user)
    {
       if($user->category != next($user->category))
       {
          echo 'Next category user';
       }
    }

Answer 1

有时候比较下一个项目很困难（比如这些）。但是，与前一个相比通常很容易。

E.g。像这样：

$users = ORM::factory('Users')
   ->order_by('category', 'ASC')
   ->find_all();
$previousCategory = null;
foreach($users as $user)
{
   if($user->category != $previousCategory)
   {
      echo 'Next category user';
   }
   $previousCategory = $user->category;
}

Answer 2

一种方法是手动搜索下一个元素，获取所需的值，然后重置回原来的位置。它很乱，但它会做你想要的：

foreach($users as $user)
{
   $current_key = $users->key();
   $next_category = $users->seek($current_key + 1) ? $users->current()->category : NULL;
   $users->seek($current_key);

   if($next_category && $user->category != $next_category)
   {
      echo 'Next category user';
   }
}

如何将属性与下一个元素进行比较

2 个答案: