检查时间范围内是否有a日
问题描述：
如何检查两个时间戳之间是否存在2月29日?
How to check if there is a February 29th in between 2 timestamps?
$date_from = '2007-06-01';
$date_to = '2013-05-30';
我知道在这个范围内2月29日是2倍，但是如何检查呢?
I know in this range there's 2 times a feb-29, but how do I check for it?
我想计算之间的天数，但but日不计算在内.
I want to count the days in between, but leap days don't count.
答
这将循环显示年份，但是在您找到a年之后会更加容易，因为下一个one年将是4年，依此类推.
This will loop through the years, but it is even easier after you find a leap year because the next one will be 4 years after, etc.
$date_from = strtotime('2007-06-01');
$date_to = strtotime('2013-05-30');
for($year=$date_from; $year<=$date_to; $year=strtotime('next year', $year)) {
echo date('Y', $year);
echo date('L', $year) ? 'Leap year' : 'Not leap year';
}
但是我认为您可以检查'Y'年是否可以被4整除.
But I think you can just check if the year 'Y' is evenly divisible by 4.