变量的碳分配未通过

Question

我在一个视图中设置了两个日期选择器；一个用于开始日期，一个用于结束日期。请求被传递到控制器索引方法，它与此 if 块交互。

如果我设置开始日期，例如1st of April，我预计：

$start_date == 2017-04-01 00:00:00
$end_date == 2017-04-08 00:00:00（一周后）

但是当我运行一个dd($start_time.' '.$end_time)块后，它returns

2017-04-08 00:00:00 2017-04-08 00:00:00

    // If start or end date is not passed, set the bookings to view the upcoming week
    if (isset($request->start_date) && isset($request->end_date))
    {
        $start_date = Carbon::parse($request->start_date);
        $end_date = Carbon::parse($request->end_date);
        if ($start_date->diffInDays($end_date, false) < 1 )
        {
            return redirect()->route('bookings.index')->with('errors', 'Please choose an end date <strong>after</strong> start date!');
        }

    }
    else if (isset($request->start_date))
    {
        $start_date = Carbon::parse($request->start_date);
        $end_date = $start_date->addWeek();
    }
    else if (isset($request->end_date))
    {
        $end_date = Carbon::parse($request->end_date);
        $start_date = ($end_date->subWeek());
    }
    else
    {
        $start_date = Carbon::now();
        $end_date = Carbon::now()->addweek();
    }

这里可能发生了什么？

Answer 1

您的代码出现问题是因为 Carbon 对象是可变的。

这基本上意味着当您执行 $end_date = $start_date->addWeek(); 时，start_date 和 end_date 都是相同的对象。

所以你可以 clone start_date 到 end_date 然后调用它的方法。

解应该是

   // If start or end date is not passed, set the bookings to view the upcoming week
    if (isset($request->start_date) && isset($request->end_date))
    {
        $start_date = Carbon::parse($request->start_date);
        $end_date = Carbon::parse($request->end_date);
        if ($start_date->diffInDays($end_date, false) < 1 )
        {
            return redirect()->route('bookings.index')->with('errors', 'Please choose an end date <strong>after</strong> start date!');
        }

    }
    else if (isset($request->start_date))
    {
        $start_date = Carbon::parse($request->start_date);
        $end_date = clone $start_date;
        $end_date = $end_date->addWeek();
    }
    else if (isset($request->end_date))
    {
        $end_date = Carbon::parse($request->end_date);
        $start_date= clone $end_date;
        $start_date= $start_date->subWeek();
    }
    else
    {
        $start_date = Carbon::now();
        $end_date = Carbon::now()->addweek();
    }

变量的碳分配未通过

Carbon Assignment to Variable not Passed

php

laravel

php-carbon