public static function subDate($day, $date = '', $timestampFlag = true, $format = 'Y-m-d H:i:s') {if (empty($date)) {$now = time();} else {注释: 不是时间截格式，是YYYY-mm-dd HH:ii:ss格式，将它们转换成时间戳格式if (!is_numeric($date)) {$datetime_array = explode(' ', $date);$date_array = explode('-', $datetime_array[0]);$time_array = explode(':', $datetime_array[1]);$now = mktime($time_array[0], $time_array[1], $time_array[2], $date_array[1], $date_array[2], $date_array[0]);} else {$now = $date;}}$m = $day * 24 * 60 * 60;$diff = $now + $m;if ($timestampFlag) {return $diff;} else {if (empty($format)) $format = 'Y-m-d H:i:s';$oldday = date($format, $diff);return $oldday;}}
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