比要求多两个小时

Question

I am getting times in format of "hh:mm:ss". I am doing sum of all those times. But here I am getting two hours more than required. so, where is the actual problem. My code is like,

foreach($result as $key=>$value)
{
    $total_markin_time[] = date('H:i:s',  strtotime($value['clock_in']));
}

Getting result like,

00:33:41
16:15:22
11:06:59
11:03:59
11:13:38
15:43:34
11:29:35

foreach ( $total_markin_time as $time )
                {
                    list( $g, $i, $s ) = explode( ':', $time );
                    //echo $g."-";
                    $total_markin_seconds += $g * 60 * 60;
                    $total_markin_seconds += $i * 60;
                    $total_markin_seconds += $s;
                }

                //echo $total_markin_seconds; exit;

                $total_markin_hours    = floor( $total_markin_seconds / 3600 );
                $total_markin_seconds -= $total_markin_hours * 3600;
                $total_markin_minutes  = floor( $total_markin_seconds / 60 );
                $total_markin_seconds -= $total_markin_minutes * 60;

When I am doing sum on this, I am gettin result 77:26:48 . Where is the problem? Updated: Is there any problem with floor that I have read like,

The floor() function rounds a number DOWN to the nearest integer, if necessary.

Answer 1

There is no error and it works right.
Calculation:
hours: 0+16+11+11+11+15+11 = 75 hours
minutes: 33+15+6+3+13+43+29 = 142 = 2 hours and 22 minutes
seconds: 41+22+59+59+38+34+35 = 288 = 4 minutes and 48 seconds
The result of sum is 77:26:48.

If you want to get just the sum of hours you should use something like this

foreach ( $total_markin_time as $time )
                {
                    list( $g, $i, $s ) = explode( ':', $time );
                    $total_markin_hours += $g;
                }

Answer 2

It's simple. All your times adds to:

288 s = 4m 48s
142 m = 2h 22m
75 h

Which in result (add hours + minutes + seconds) gives 77:26:48

You may think that You only add hours independent of minutes and seconds, but You have to add overflows of minutes and seconds.