Calculeted time adding together in php (H:i:s) - php

Question

I have a query which returns me some data.
//I loop through the query's result and write all data out
while($row =$result->fetch_assoc()){
echo $row['place'] . '|';
echo $row['gets_busy'] . '|';
echo $row['gets_empty '] . '|';
echo $row['time_between'] . '|';
echo "<br>";
}
ROOM01|2021-03-05 12:02:56|2021-03-05 12:04:02|00:01:06|
ROOM01|2021-03-05 12:05:42|2021-03-05 12:07:48|00:02:06|
ROOM01|2021-03-05 12:07:48|2021-03-05 12:12:54|00:05:06|
ROOM02|2021-03-05 12:15:54|2021-03-05 12:17:00|00:01:06|
ROOM02|2021-03-05 12:17:01|2021-03-05 12:23:17|00:05:16|
ROOM02|2021-03-05 12:23:59|2021-03-05 12:25:45|00:01:46|
I want something to write for the user like:
ROOM01 was busy for -> 00:08:18 during 2021-03-05
ROOM02 was busy for -> 00:08:08 during 2021-03-05
Can this be accomplished by PHP?

Answer 1

You can group into another array, by using the places and date as keys.
while($row = $result->fetch_assoc())
{
$place = $row['place']; // shortcut
$start = strtotime($row['gets_busy']); // start timestamp
$stop = strtotime($row['gets_empty']); // end timestamp
$time = $stop - $start; // duration in seconds
$date = date('Y-m-d', $start); // date for grouping
// group by place and date
if (!isset($data[$place][$date])) {
$data[$place][$date] = 0; // init with 0
}
$data[$place][$date] += $time; // add time.
}
// now, display data :
foreach ($data as $place => $dates) {
echo $place . ':<br>';
foreach ($dates as $date => $duration) {
$interval = new DateInterval('PT'.$duration.'S');
echo ' -> ' . $date . ' : ' . $interval->format('%h:%i:%s') . '<br>';
}
}