php get years between two dates
取2日期間共幾年
/*
get years between two dates
https://vector.cool
date $date ex：2006/3/8
date $date2 ex：2017/5/14
return int
*/
function get_years_between_two_dates($date,$date2=NULL){
$time = (empty($date2))?time():strtotime($date2);
$time = $time - strtotime($date);
return intval($time / (365*24*60*60));
}用法：
這邊有個要注意的地方，使用這方法須先設定時區
date_default_timezone_set()
date_default_timezone_set("Asia/Taipei");
echo get_years_between_two_dates('2007/7/28','2017/12/23');
