php 使用 Carbon 递增日期
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Incrementing dates with Carbon
提问by Kevin Daniel
I'm trying to create an array of blackout dates for a reservation system in Laravel 4. There is one test row in my db with a start_date of 2016-01-24 and end_date of 2016-01-29.
我正在尝试为 Laravel 4 中的预订系统创建一系列停电日期。我的数据库中有一个测试行，start_date 为 2016-01-24，end_date 为 2016-01-29。
This is the code that pulls the row and loops through the dates using Carbon to increment by one day & add it to an array:
这是使用 Carbon 拉出行并循环遍历日期以增加一天并将其添加到数组的代码：
$reserved = Reservation::where('property_id', $property->id)->get();
$blackoutDays = [];
foreach($reserved as $r)
{
$start = new \Carbon\Carbon($r->start_date);
$end = new \Carbon\Carbon($r->end_date);
$days = $start->diff($end)->days;
for($i = 0; $i <= $days; $i++)
{
$date = '';
$date = $start->addDays($i);
$blackoutDays[] = $date->format('Y-m-j');
}
}
What I'm trying to get in $blackoutDays is:
我想在 $blackoutDays 中得到的是：
["2016-01-24", "2016-01-25", "2016-01-26", "2016-01-27", "2016-01-28", "2016-01-29"]
[“2016-01-24”、“2016-01-25”、“2016-01-26”、“2016-01-27”、“2016-01-28”、“2016-01-29”]
But what I'm actually getting is this:
但我实际得到的是：
["2016-01-24", "2016-01-25", "2016-01-27", "2016-01-30", "2016-02-3", "2016-02-8"]
[“2016-01-24”、“2016-01-25”、“2016-01-27”、“2016-01-30”、“2016-02-3”、“2016-02-8”]
Does anyone know why this is happening / how to fix it? Is there a better way of doing this?
有谁知道为什么会这样/如何解决？有没有更好的方法来做到这一点？
回答by ArSeN
You do increment $ievery run of your for loop. So it adds 1 in the first run, 2 days in the second, 3 days in the third and so on.
您确实会增加$ifor 循环的每次运行。所以它在第一次运行时加 1，第二次加 2 天，第三次加 3 天，依此类推。
Therefore, you want to replace
因此，您要更换
$date = $start->addDays($i);
with
和
$date = $start->addDays(1);
Where you probably fell into the pit is the idea that the days are added from the $startdate object on every call, but this is not the case, as this object is not "Immutable".
您可能陷入困境的想法是$start每次调用时都从日期对象添加日期，但事实并非如此，因为该对象不是“不可变的”。
回答by Odin Thunder
For more cleaner result, you can use addDay() method:
为了获得更清晰的结果，您可以使用 addDay() 方法：
$date = $start->addDay();
But in fact this is exactly the same. Source code for addDay() method:
但实际上这是完全一样的。addDay() 方法的源代码：
/**
* Add a day to the instance
*
* @param int $value
*
* @return static
*/
public function addDay($value = 1)
{
return $this->addDays($value);
}
