mysql 5.5.50 Calculate one day multiple events to one - mysql

Question

I have a problem with my thinking and I must ask someone to help.
I create simply working time tracking system and I can manage all other things with that code, but I cannot now figure out how I can calculate following data.
Fist, I have couple tables and one store four things.
index | who | timestamp | what
1 | 1 | 2016-09-21 08:00:00 | Work
2 | 2 | 2016-09-21 08:01:00 | Work
3 | 1 | 2016-09-21 10:00:00 | Bin
4 | 2 | 2016-09-21 10:00:00 | Bin
5 | 1 | 2016-09-21 10:15:00 | Bout
6 | 2 | 2016-09-21 10:17:00 | Bout
7 | 2 | 2016-09-21 13:00:00 | Bin
8 | 1 | 2016-09-21 13:00:00 | Bin
9 | 1 | 2016-09-21 13:30:00 | Bout
10 | 2 | 2016-09-21 13:30:00 | Bout
11 | 2 | 2016-09-21 15:58:00 | Home
12 | 1 | 2016-09-21 16:05:00 | Home
I can nicely calculate times between Work and Home and got right value to the right person.
But I'm stuck now with those break times.
I need calculate all possible breaks together per person and that way get a total time what is spend to breaks per person.
So I need something like following answer when ask person 1 info:
Who | Time | Breaktime | Working time
1 | 08:05:00 | 00:45:00 | 07:20:00
Or maybe all persons can came to same page when ask specific day...
Who | Time | Breaktime | Working time
1 | 08:05:00 | 00:45:00 | 07:20:00
2 | 07:57:00 | 00:47:00 | 07:10:00
There is always pairs with events. Work -> Home and Bin -> Bout.
And yes, there is much more persons and could be much more brake times per person.
That might be a bad presentation, sorry about that (NooB). I hope I give that much information as someone can help. But ask if there is something to ask.
That is code what I use when I solve one day total time at working place.
SELECT TIMEDIFF(
(SELECT timestamp FROM `stamps` WHERE (who like '1' and DATE (timestamp) like '2016-09-21' and what like 'Home')),
(SELECT timestamp FROM `stamps` WHERE (who like '1' and DATE (timestamp) like '2016-09-21' and what like 'Work'))
)
But I cannot use it with multiple events.

Answer 1

That is what I found. Maybe not nice, but it works =).
$break = mysqli_query($conn,"SELECT what, timestamp FROM stamps WHERE (who like '$id' and DATE (timestamp) like '$day' and what like 'B%') ORDER BY timestamp");
while($row = mysqli_fetch_array($break))
{
if ( $row['what'] == "Bin" )
$start = strtotime( $row['timestamp'] );
else { $stop = strtotime( $row['timestamp'] );
$hours += ( $stop - $start );
}
}
$btime = gmdate('H:i:s', floor($hours));
$btime gives 00:00:00 style result.