我在传递一些参数的功能上喜欢

everyWeekOn("Mon",11,19,00)

我想计算当天的差额(例如“星期五”)
并通过参数日,即星期一

输出应为：

The difference between Mon and Fri is 3

我这样尝试过

 $_dt = new DateTime();
 error_log('$_dt date'. $_dt->format('d'));
 error_log('$_dt year'. $_dt->format('Y'));
 error_log('$_dt month'. $_dt->format('m'));

但是知道我不知道下一步该怎么做才能获得两天的差额.

请注意,此问题与How to calculate the difference between two dates using PHP?不同,因为我只有一天而不是一个完整的日期.

解决方法:

只需结合-> diff方法实现DateTime类：

function everyWeekOn($day) {
    $today = new DateTime;
    $next = DateTime::createFromFormat('D', $day);
    $diff = $next->diff($today);
    return "The difference between {$next->format('l')} and {$today->format('l')} is {$diff->days}";
}

echo everyWeekOn('Mon');