YouTube-like "last updated" in PHP

// format last updated min/sec
 $s = $time-$lastupdate;
if($s>31557600){ $s=floor($s/31557600); if($s>1) $ss='s'; else $ss=''; $s.=" year$ss"; } elseif($s>2629800){ $s=floor($s/2629800); if($s>1) $ss='s'; else $ss=''; $s.=" month$ss"; } elseif($s>604800){ $s=floor($s/604800); if($s>1) $ss='s'; else $ss=''; $s.=" week$ss"; } elseif($s>86400){ $s=floor($s/86400); if($s>1) $ss='s'; else $ss=''; $s.=" day$ss"; } elseif($s>3600){ $s=floor($s/3600); if($s>1) $ss='s'; else $ss=''; $s.=" hour$ss"; } elseif($s>60){ $s=floor($s/60); if($s>1) $ss='s'; else $ss=''; $s.=" minute$ss"; } else{ if($s<>1) $ss='s'; else $ss=''; $s.=" second$ss"; } $lastup=$s;