Calculate elapsed time in php

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This will give you the number of seconds between start and end.

<?php

// microtime(true) returns the unix timestamp plus milliseconds as a float
$starttime = microtime(true);
/* do stuff here */
$endtime = microtime(true);
$timediff = $endtime - $starttime;

?>

To display it clock-style afterwards, you’d do something like this:

<?php

// pass in the number of seconds elapsed to get hours:minutes:seconds returned
function secondsToTime($s)
{
    $h = floor($s / 3600);
    $s -= $h * 3600;
    $m = floor($s / 60);
    $s -= $m * 60;
    return $h.':'.sprintf('%02d', $m).':'.sprintf('%02d', $s);
}

?>

If you don’t want to display the numbers after the decimal, just add round($s); to the beginning of the secondsToTime() function.

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