Output is in seconds. convert to hh:mm:ss format in php

1)

function foo($seconds) {
  $t = round($seconds);
  return sprintf('%02d:%02d:%02d', ($t/3600),($t/60%60), $t%60);
}

echo foo('290.52262423327'), "\n";
echo foo('9290.52262423327'), "\n";
echo foo(86400+120+6), "\n";

prints

00:04:51
02:34:51
24:02:06

2)

echo round($time, 2);

Try this one

echo gmdate("H:i:s", 90);

$iSeconds = 290.52262423327;
print date('H:i:s', mktime(0, 0, $iSeconds));