php实现求相对时间函数

$now) $relative = 'in the future'; else { $diff = $now - $time; if ($diff >= $limit) $relative = date($format,$time); elseif ($diff < 60) { $relative = 'less than one minute ago'; } elseif (($minutes = ceil($diff / 60)) < 60) { $relative = $minutes . ' minute' . (((int)$minutes === 1) ? '' : 's') . ' ago'; } else { $hours = ceil($diff / 3600); $relative = 'about ' . $hours . ' hour' . (((int)$hours === 1) ? '' : 's') . ' ago'; } } return $relative; }