PHP通用函數 - 日期生成時間軸

/**
 * 時間軸函數, Unix 時間戳
 * @param int $time 時間
 */
function TranTime($time) {
    //$time = strtotime($time);
    $nowTime = time (); 
    $message = ''; 
    //一年前
    if (idate ( 'Y', $nowTime ) != idate ( 'Y', $time )) {
        $message = date ( 'Y年m月d日', $time );
    }
    else {
        //同一年
        $days = idate ( 'z', $nowTime ) - idate ( 'z', $time );
        switch(true){
            //一天內
            case (0 == $days):
                $seconds = $nowTime - $time;
                //一小時內
                if ($seconds < 3600) {
                    //一分鍾內
                    if ($seconds < 60) {
                        if (3 > $seconds) {
                            $message = '剛剛';
                        } else {
                            $message = $seconds . '秒前';
                        }
                    }
                    $message = intval ( $seconds / 60 ) . '分鍾前';
                }
                $message = idate ( 'H', $nowTime ) - idate ( 'H', $time ) . '小時前';
                break;
                //昨天
            case (1 == $days):
                $message = '昨天' . date ( 'H:i', $time );
                break;
                //前天
            case (2 == $days):
                $message = '前天 ' . date ( 'H:i', $time );
                break;
                //7天內
            case (7 > $days):
                $message = $days . '天前';
                break;
                //超過7天
            default:
                $message = date ( 'n月j日 H:i', $time );
                break;
        }
    }
    return $message;
}