[PHP基础]PHP，日期时间与秒数的相互转换

// 设置时区date_default_timezone_set("Asia/Shanghai");// 首先取得当前的日期和时间$date_time = date("Y-n-j-G-i-s");$date_time_seconds = date("U");echo "当前日期为：".$date_time;echo "<br />";echo "当前日期的秒数为：".strval($date_time_seconds);echo "<br />";function DatetimeToSeconds($date_time) {    $result = array();    $result = split("-", $date_time);    $year = $result[0];    $month = $result[1];    $day = $result[2];    $hour = $result[3];    $minite = $result[4];    $second = $result[5];    // 开始计算    $seconds = mktime($hour, $minite, $second, $month, $day, $year);    return $seconds;}function SecondsToDatetime($date_time_seconds) {    $result = date("Y-n-j-G-i-s", $date_time_seconds);    return $result;}$date_time2 = SecondsToDatetime($date_time_seconds);$date_time_seconds2 = DatetimeToSeconds($date_time);echo "当前日期为：".$date_time2;echo "<br />";echo "当前日期的秒数为：".strval($date_time_seconds2);echo "<br />";