Find Difference between leader and Previous in results table

Question

Edited: (added table example)

With your help guys I\'m in this place that I have information in table ( Name, team, start time finish time and even time between these tw

Answer 1

$date2 = date_create($date2InString);
$date1 = date_create($date1InString);
date_diff($date2, $date1)->format('%h %i %s' );

for more formats: http://php.net/manual/en/function.date-diff.php

below code should do what you asked for

$timestamp = strtotime($row['synd']);
 print '<tr>';
  print '<td>' .$row["ranking"].'</td>';
 print '<td>'.removeParanthesis($row["klass"]).'</td>';
   print '<td>'.$row["nimi"].'  '.$row["Perekonnanimi"].'</td>';
     print '<td>'.$date = date('d-m-Y', $timestamp).'</td>';
    print '<td>'.$row["teamnimi"].'</td>';
print '<td>'.$row["start"].'</td>';
print '<td>'.$row["finish"].'</td>';
print '<td>'.$row["aeg"].'</td>';
print '<td>'.$row["difleader"].'</td>';
print '<td>'.$row["difprev"].'</td>';
$date2 = date_create($row["difprev"]);
$date1 = date_create($row["difleader"]);
date_diff($date2, $date1)->format('%h %i %s' );
print '<td>'.$row["speed"].'</td>';
 print '</tr>';

Answer 2

you can work out the diff from leader by remembering the leaders time, and the previous time as you run through the loop.

lets add an elapsed_time into the query

SELECT 
 klass, nimi, synd, teamnimi, start, 
 TIME(`finish`) AS finish,
 timediff(time(finish), time(start)) AS aeg,
 finish - start as elapsed_time
FROM bc2014 T1 
INNER JOIN bc2014aeg T2 on T1.bc2014_id = T2.bc2014_id
WHERE klass = 'DS1 (1 koera toukerattavedu al.14 a.)'
ORDER BY aeg

Then use this in the result set to calculate the time differences

while($row = $results->fetch_array()) {
//.....

  if(isset($leader_time)){
    print '<td>'. $row["elapsed_time"] - $leader_time .'s</td>';
    print '<td>'. $row["elapsed_time"] - $last_time .'s</td>';
  } else { 
    print '<td> </td>';
    print '<td> </td>';
  }
// ...
  if(!isset($leader_time)){ $leader_time = $row["elapsed_time"] ;} 
  $last_time = $row["elapsed_time"] ;
}

you can then use $leader_time and $last_time to calculate the two difference columns