PHP 友好时间提示

/**
     * 友好时间提示
     *
     * @param int $time 时间戳
     * @return bool|false|string
     */
    function date_friend_tips($time)
    {
        if (!$time)
            return false;
        if (!is_numeric($time)) {
            $time = strtotime($time);
        }
        $d = time() - intval($time);
        $ld = $time - mktime(0, 0, 0, 0, 0, date('Y')); //得出年
        $md = $time - mktime(0, 0, 0, date('m'), 0, date('Y')); //得出月
        $byd = $time - mktime(0, 0, 0, date('m'), date('d') - 2, date('Y')); //前天
        $yd = $time - mktime(0, 0, 0, date('m'), date('d') - 1, date('Y')); //昨天
        $dd = $time - mktime(0, 0, 0, date('m'), date('d'), date('Y')); //今天
        $td = $time - mktime(0, 0, 0, date('m'), date('d') + 1, date('Y')); //明天
        $atd = $time - mktime(0, 0, 0, date('m'), date('d') + 2, date('Y')); //后天
        if ($d == 0) {
            $fdate = '刚刚';
        } else {
            switch ($d) {
                case $d < $atd:
                    $fdate = date('Y年m月d日', $time);
                    break;
                case $d < $td:
                    $fdate = '后天' . date('H:i', $time);
                    break;
                case $d < 0:
                    $fdate = '明天' . date('H:i', $time);
                    break;
                case $d < 60:
                    $fdate = $d . '秒前';
                    break;
                case $d < 3600:
                    $fdate = floor($d / 60) . '分钟前';
                    break;
                case $d < $dd:
                    $fdate = floor($d / 3600) . '小时前';
                    break;
                case $d < $yd:
                    $fdate = '昨天' . date('H:i', $time);
                    break;
                case $d < $byd:
                    $fdate = '前天' . date('H:i', $time);
                    break;
                case $d < $md:
                    $fdate = date('m月d日 H:i', $time);
                    break;
                case $d < $ld:
                    $fdate = date('m月d日', $time);
                    break;
                default:
                    $fdate = date('Y年m月d日', $time);
                    break;
            }
        }
        return $fdate;
    }