PHP: How to echo remaining time in minutes from microtime

Solution:

There are sixty (60) seconds in one (1) minute. To convert seconds to minutes, simply divide the amount of seconds by sixty (60).

$tstart = (string) microtime(true); // casting to string shows type doesn't matter
sleep(3); // for variance
$tstop = microtime(true);
$diffSeconds = round($tstop-$tstart);
$diffMinutes = ceil($diffSeconds/60); // here is the division

echo $diffSeconds.'second'.($diffSeconds==1?'':'s')."\n"; // assuming plain text out
echo $diffMinutes.'minute'.($diffMinutes==1?'':'s')."\n";
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Outputs:

in seconds: 3.0001471042633

in minutes: 0.050002451737722