如何检查日期是否在给定范围内？

使用strtotime将它们转换为时间戳是正确的方法，例如

$start_date = '2009-06-17';$end_date = '2009-09-05';$date_from_user = '2009-08-28';check_in_range($start_date, $end_date, $date_from_user);function check_in_range($start_date, $end_date, $date_from_user){  // Convert to timestamp  $start_ts = strtotime($start_date);  $end_ts = strtotime($end_date);  $user_ts = strtotime($date_from_user);  // Check that user date is between start & end  return (($user_ts >= $start_ts) && ($user_ts <= $end_ts));}