如何查找PHP中另一个日期范围内的日期范围内有多少天？

Question

我使用碳PHP库。重复问题中的答案使用PHP的内置函数。

count how many days within a date range are within another date range

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下面是我用它来找到，如果日期范围（$userDateStart和$userDateEnd）是与另一个日期范围（$couponStart and $ couponEnd`）的代码，它没有任何错误工作正常，但我不知道如何找到这个日期范围内重叠/存在的日子？

我使用的库是http://carbon.nesbot.com/docs/

预期的结果应该是4在这case..Hope你会帮我的。

$userDateStart = Carbon::createFromFormat('Y-m-d','2015-06-26'); 
$userDateEnd = Carbon::createFromFormat('Y-m-d','2015-06-29'); 

$couponStart = Carbon::createFromFormat('Y-m-d','2015-06-26'); 
$couponEnd = Carbon::createFromFormat('Y-m-d','2015-10-31'); 

if(($userDateStart >= $couponStart && $userDateEnd <= $couponEnd) || 
    ($couponStart >= $userDateStart && $couponEnd <= $userDateEnd)){ 
    die("Yes,The date is within this date range"); 
} 
die("No,It is not within this date range"); 

Answer 1

根据系统提供的文档，你需要使用：

$dt = Carbon::create(2012, 4, 30, 0); 
echo $dt->diffInDays($dt->copy()->addMonth()); // 30 
echo $dt->diffInDays($dt->copy()->addWeek()); // 7 

因此，为了与你的程序的工作我想你需要这样做：

$userDateStart = Carbon::createFromFormat('Y-m-d','2015-06-26'); 
$userDateEnd = Carbon::createFromFormat('Y-m-d','2015-06-29'); 

$couponStart = Carbon::createFromFormat('Y-m-d','2015-06-26'); 
$couponEnd = Carbon::createFromFormat('Y-m-d','2015-10-31'); 

//Determin the highest date from the starts and the minimum dates from the ends 
$startBetweenDate = $userDateStart->max($couponStart); 
$endBetweenDate = $userDateEnd->min($couponEnd); 

//Now find how many days are between 
echo $startBetweenDate->diffInDays($endBetweenDate); //Should be 4 

请注意：由于我没有安装Carbon的库，因此未进行测试。