PHP round the time to the nearest 15 seconds

Question

This is not a duplicate question, but involves a little understanding about time.

I need a solution to the following problem I have a number of specifically produced tim

Answer 1

You're massively overcomplicating this, just do rounding on the Unix timestamp level:

function roundMyTime($time)
{
  $time = strtotime($time);
  $time = 15*round($time/15);
  echo date('H:i:s', $time)."\n";
}
roundMyTime('18:35:17');
roundMyTime('18:35:27');
roundMyTime('18:35:37');
roundMyTime('18:35:47');
roundMyTime('18:35:57');
roundMyTime('18:36:07');
roundMyTime('18:36:17');

Outputs:

18:35:15
18:35:30
18:35:30
18:35:45
18:36:00
18:36:00
18:36:15

Demo here.