laravel使用原生mysql内置函数

有些时候 需要用到mysql内置函数，laravel文档没有写清楚

文档里有个 DB::raw()

$sum = '*,
        sum(register_user) as register_user,
        sum(pv) as pv,
        sum(uv) as uv,
        sum(login_user) as login_user';

$user = User::select(DB::raw($sum))
        ->where("$search",'like',"%$searchNum%")
        ->whereBetween('savetime',[$startTime,$endTime])
        ->groupBy(DB::raw("WEEKOFYEAR(FROM_UNIXTIME(savetime, '%Y-%m-%d %H:%i:%S'))"),'IP')
        ->orderBy($orderBy,$order);

利用DB::raw 就可以使用mysql 内置函数

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