php返回相对时间（如：20分钟前，3天前）的方法

php返回相对时间（如：20分钟前，3天前）的方法

 function plural($num) {     if($num != 1)      return "s"; }function getRelativeTime($date) {  $diff = time() - strtotime($date);  if ($diff<60)   return $diff." 秒".plural($diff)." 前";  $diff = round($diff/60);  if ($diff<60)  return $diff." 分钟".plural($diff)." 前";  $diff = round($diff/60);  if ($diff<24)   return $diff." 小时".plural($diff)." 前";  $diff = round($diff/24);  if ($diff<7)   return $diff." 天".plural($diff)." 前";  $diff = round($diff/7);  if ($diff<4)   return $diff." 星期".plural($diff)." 前";  return "on ".date("F j, Y", strtotime($date)); }