PHP 時間軸

function tranTime($time) {
    $rtime = date("m-d H:i",$time);
    $htime = date("H:i",$time);

    $time = time() - $time;

    if ($time < 60) {
        $str = '剛剛';
    }
    elseif ($time < 60 * 60) {
        $min = floor($time/60);
        $str = $min.'分鐘前';
    }
    elseif ($time < 60 * 60 * 24) {
        $h = floor($time/(60*60));
        $str = $h.'小時前 '.$htime;
    }
    elseif ($time < 60 * 60 * 24 * 3) {
        $d = floor($time/(60*60*24));
        if($d==1)
           $str = '昨天 '.$rtime;
        else
           $str = '前天 '.$rtime;
    }
    else {
        $str = $rtime;
    }
    return $str;
}