循环浏览给定的日期

Question

I have a weird scenario like I have given four dates and I need to call a method based on these dates. That is first I need to call the function for start time as 1st of the month and end time as 15th of the month. This function again needs to be called for start time 16th of the month and end date 30th/31st of the month. I can call the functions two times with hard-coded values, but is there any better method to do this?

I am using Carbon library for PHP and creating the dates like this

$this->firstDay = Carbon::now()->startOfMonth()->subMonth()>toDateString();

$this->lastDay = Carbon::now()->subMonth()->endOfMonth()>toDateString();

$this->firstHalf   = Carbon::parse($this->firstDay)->addDays(15)->toDateString();

$this->secondStart = Carbon::parse($this->firstDay)->addDays(16)->toDateString();

and the method I need to call have the following code

return $this
            ->database
            ->table('table')
            ->selectRaw('SUM(points) AS points, id')
            ->whereBetween('date', [$firstDay, $firstHalf])
            ->groupBy('id')
            ->get();

These will give the corresponding dates and now I need to run the method as start time as firstDay and end time as firstHalf and then again to call with start time as secondStart and end as lastDay . Basically what I am trying to do is to avoid the duplication of the code by writing the query two times.

How can this be done?

Answer 1

You might be better off setting the variables to the actual Carbon instances.

Taking into consideration months that have 28 or 29 days, you can grab the last day of the previous month and divide that by 2 to find the mid-point.

$lastMonth = Carbon::now()->subMonth();

$start = $lastMonth->startOfMonth();
$end = $lastMonth->endOfMonth();
$middle = floor($end->days / 2);

$firstDay = $start->toDateString();
$firstHalf = $start->addDays($middle)->toDateString();

$lastDay = $end->toDateString();
$secondHalf = $start->addDays($middle + 1)->toDateString();

Edit: updated example to reflect the variables used in your updated question

Edit 2: If you're using Laravel/Eloquent, you may even be able to pass the actual Carbon instances directly to the Query Builder, without calling toDateString() .