Question

我正在使用输出数组的foreach循环

$dinnerDetails = array();
$lastDinnerDate = '';
$newDate = '';
foreach ($invitations as $invitation) {
    $lastDinnerDate = $invitation['dinner_date'];
    if ($invitation['dinner_date'] > $lastDinnerDate) {
        $newDate = 'yes';

    } else {
        $newDate = 'no';
    }

    $dinnerDetails[] = array(
        'request_id' => $invitation['request_id'],
        'dinner_date' => $invitation['dinner_date'],
        'dinner_id' => $invitation['dinner_id'],
        'new_dinner' => $newDate
    );
}

输出看起来像这样

array:4 [▼
  0 => array:3 [▼
    "request_id" => "48"
    "dinner_id" => "36"
    "dinner_date" => "2016-05-16T10:00:00"
    "new_date" => "yes"
  ]
  1 => array:3 [▼
    "request_id" => "51"
    "dinner_id" => "40"
    "dinner_date" => "2016-05-16T10:00:00"
    "new_date" => "no"
  ]
  2 => array:3 [▼
    "request_id" => "50"
    "dinner_id" => "36"
    "dinner_date" => "2016-05-27T10:00:00"
    "new_date" => "yes"
  ]
  3 => array:3 [▼
    "request_id" => "52"
    "dinner_id" => "41"
    "dinner_date" => "2016-05-27T10:00:00"
    "new_date" => "no"
  ]
]

我的问题是如何计算dinner_id出现的次数。我想将该值作为数组的一部分传递，因为$dinnerDetails被传递给视图，因此它可以更容易地显示计数。该视图已经通过foreach循环显示数据，它只是每个dinner_id所需的计数

Answer 1

我假设你想要计算ID而不是标签/名称本身，一个如此简单的方法就是这样做，只需将它放在foreach循环

$countDinner[$invitation['dinner_id']] = isset($countDinner[$invitation['dinner_id']]) ? $countDinner[$invitation['dinner_id']] + 1 : 1;

一个coud也使用if子句而不是三元运算符如果一个人受到伤害，不要忘记放置

$countDinner = array();

在初始化数组的foreach循环之前，您现在应该有一个数组，其中包含每个dinner_id的计数。

要将其添加到现有数组，只需按以下方式循环：

foreach($dinnerDetails as &$dinnerDetail){
    $dinnerDetail['count'] = $countDinner[$dinnerDetail['dinner_id']];
}

，最终结果将如下所示

  0 => array:3 [▼
    "request_id" => "48"
    "dinner_id" => "36"
    "dinner_date" => "2016-05-16T10:00:00"
    "new_date" => "yes"
    "count" => 2
  ]

计算数组

1 个答案: