Convert seconds into days, hours, minutes and seconds

Question

I would like to convert a variable $uptime which is seconds, into days, hours, minutes and seconds.

Example:

Answer 1

an extended version of Glavić's excellent solution , having integer validation, solving the 1 s problem, and additional support for years and months, at the expense of being less computer parsing friendly in favor of being more human friendly:

diff ( $dtT );
    foreach ( array (
            'y' => 'year',
            'm' => 'month',
            'd' => 'day',
            'h' => 'hour',
            'i' => 'minute',
            's' => 'second' 
    ) as $time => $timename ) {
        if ($diff->$time !== 0) {
            $ret .= $diff->$time . ' ' . $timename;
            if ($diff->$time !== 1 && $diff->$time !== -1 ) {
                $ret .= 's';
            }
            $ret .= ' ';
        }
    }
    return substr ( $ret, 0, - 1 );
}

var_dump(secondsToHumanReadable(1*60*60*2+1)); -> string(16) "2 hours 1 second"