time elapsed

<?
$nowtime = time();
$oldtime = GetValueInteger(37742 /*[Eltako FSB61\Start Time]*/); //Startzeit
$count = time_elapsed($nowtime-$oldtime);
$prozent = $count / 56 *100;
$timeprint = round($count / 56 * 100)."% (".$count.")";
SetValue(57245 /*[Eltako FSB61\Time Elapsed]*/, $timeprint);

/** Output:
Gerät eingeschaltet: 6d 15h 48m 19s
**/


 function time_elapsed($secs){
    $bit = array(
        'y' => $secs / 31556926 % 12,
        'w' => $secs / 604800 % 52,
        'd' => $secs / 86400 % 7,
        'h' => $secs / 3600 % 24,
        'm' => $secs / 60 % 60,
        's' => $secs % 60
        );
        
    foreach($bit as $k => $v)
        if($v > 0)$ret[] = $v . $k;
        
    return join(' ', $ret);
    }  
?>