以时间格式添加$interval1和interval2

Question

我为我最后一次没有提问道歉properly.it是我在stackflow.please上提出的第一个问题帮助我以时间格式添加$interval1和interval2我花了一整天的时间尝试这个.thank u。

public function calculate_time_lap() {
       $formate = "%h:%i";
        $time1 = $this->input->post('time1');

        $time2 = $this->input->post('time2');
        $time3 = $this->input->post('time3');

        $time4 = $this->input->post('time4');


        $datetime1 = date_create($time1);
        $datetime2 = date_create($time2);
        $datetime3 = date_create($time3);
        $datetime4 = date_create($time4);

        $interval1 = date_diff ( $datetime2, $ datetime1);


        $interval2 = date_diff( $datetime4, $datetime3);
     add//  ( $interval=($interval1,$interval2));

       echo $interval->format($formate);
    }

Answer 1

将两个时间相加，需要将它们转换为秒

$date1='3:20:10';
$date2='14:25:10';
$tmstamp = strtotime($date2) - strtotime($date1);

echo gmdate("H:i:s", $tmstamp);