function duration($seconds, $compact=false, $use=null) {
$periods = array (
‘years’ => 31556926,
‘months’ => 2629743,
‘weeks’ => 604800,
‘days’ => 86400,
‘hours’ => 3600,
‘minutes’ => 60,
‘seconds’ => 1
);
$zeros = false;
$seconds = (float)$seconds;
$segments = array();
foreach ($periods as $period => $value) {
if ($use && strpos($use, $period[0]) === false) continue;
$count = floor($seconds / $value);
if ($count == 0 && !$zeros) continue;
$key = $compact ? substr($period,0,1) : $period;
$segments[strtolower($key)] = $count;
$seconds = $seconds % $value;
}
$string = array();
foreach ($segments as $key => $value) {
$segment_name = $compact ? $key : ‘ ‘.substr($key,0,-1);
$segment = $value.$segment_name;
if ($compact==false && $value!=1) $segment .= ‘s’;
$string[]=$segment;
}
if ( $compact ) return implode(‘ ‘, $string);
return implode(‘, ‘, $string);
}

echo time_duration(123, ‘yMd’);
echo time_duration(0);