Question

如何使用PHP查找两天 not dates 之间的天数？

我知道如何获取两个日期之间的天数，但我的输入值是日期名称（日期无知）。

输入/输出：

Wednesday和Saturday返回3

Sunday和Wednesday返回3

Answer 1

使用PHP date_diff()函数（docs）。

$datetime1 = date_create($date_1);
$datetime2 = date_create($date_2);

$interval = date_diff($datetime1, $datetime2);

echo $interval->format('%d'); // For days

根据澄清，您可以创建任意的星期六和星期三来计算它：

$datetime1 = date_create(date('Y-m-d',strtotime('wednesday')));
$datetime2 = date_create(date('Y-m-d',strtotime('saturday')));

$interval = date_diff($datetime1, $datetime2);

echo $interval->format('%d'); // For days

会返回“3”，但取决于你运行它。

Answer 2

您的任务似乎根本不需要日期功能。一个简单的查找数组就足够了。

代码：（Demo）

function daysUntil($start,$end){
    $lookup=['Sunday'=>0,'Monday'=>1,'Tuesday'=>2,'Wednesday'=>3,'Thursday'=>4,'Friday'=>5,'Saturday'=>6];
    $days=$lookup[$end]-$lookup[$start];
    return "From $start to $end: ".($days<1?$days+7:$days);
}

echo daysUntil('Wednesday','Saturday'),"\n";  // Thursday, Friday, Saturday
echo daysUntil('Monday','Friday'),"\n";       // Tuesday, Wednesday, Thursday, Friday
echo daysUntil('Thursday','Thursday'),"\n";   // [assumed next week]
echo daysUntil('Friday','Monday'),"\n";       // Saturday, Sunday, Monday
echo daysUntil('Saturday','Sunday'),"\n";     // Sunday
echo daysUntil('Sunday','Saturday'),"\n";     // Monday, Tuesday, Wednesday, Thursday, Friday, Saturday
echo daysUntil('Sunday','Wednesday');         // Monday, Tuesday, Wednesday

输出：

From Wednesday to Saturday: 3
From Monday to Friday: 4
From Thursday to Thursday: 7
From Friday to Monday: 3
From Saturday to Sunday: 1
From Sunday to Saturday: 6
From Sunday to Wednesday: 3

或者您可以使用4个函数调用替换查找数组：

$days=date('w',strtotime($end))-date('w',strtotime($start));

http://sandbox.onlinephpfunctions.com/code/b349aae527654d25a3dbd92df2a3dde386ca423a

Answer 3

您可以在新的DateTime类中编写要解析的日期名称：

<?php
  $datetime1 = new DateTime('Sunday');
  $datetime2 = new DateTime('Wednesday');
  $interval = $datetime1->diff($datetime2);
  echo $interval->format('%R%a days');
  ?>

也低于一行版本：

echo (new DateTime('Sunday'))->diff(new DateTime('Wednesday'))->format('%a days');

Answer 4

public function numOfDaysBetween($start,$end)
{
$days=[0=>'Saturday',1=>'Sunday',2=>'Monday',3=>'Tuesday',4=>'Wednesday',5=>'Thursday',6=>'Friday'];
$index_start=array_search($start, $days);
    $index_end=array_search($end, $days);
    if($index_start==$index_end)
    {
        return 7;
    }else if($index_start<$index_end)
    {
        return $index_end-$index_start;
    }else
    {
        return 7-($index_start-$index_end);
    }

}

如何查找一周两天之间的天数？

4 个答案: