PHP计算两个日期相差的年月日时分秒

$start_time = ‘2017-09-06 15:12:20‘;$end_time = ‘2018-09-08 10:20:45‘;get_time($start_time,$end_time);function get_time($start,$end){ ???$start = strtotime($start); ???$end = strtotime($end); ???if ($start > $end){ ???????$diff_time = $start-$end; ???}else{ ???????$diff_time = $end-$start; ???} ???$year_t = 3600*24*365; ???$day_t = 3600*24; ???$hours_t = 3600; ???$minute_t = 60; ???$year = floor($diff_time/$year_t); ???$days = floor(($diff_time-$year*$year_t)/$day_t); ???$hours = floor(($diff_time-($year*$year_t)-($days*$day_t))/$hours_t); ???$minute = floor(($diff_time-($year*$year_t)-($days*$day_t)-$hours*$hours_t)/$minute_t); ???$seconds = $diff_time - $minute*$minute_t-$hours*$hours_t-$days*$day_t-$year*$year_t;// ???$minute = floor(); ???echo $year.‘年‘.$days.‘天‘.$hours.‘小时‘.$minute.‘分钟‘.$seconds.‘秒‘;}