$sql = "SELECT ←普通のSQL文
FROM
WHERE " ;
DB::table('app_user_user AS uu')
->select( ~ ~
) ->leftJoin( DB::raw("( $sql ) AS sc ") , 'uu.id', '=', 'sc.user_id')
$juhuku = DB::table('issuers') ->orWhere(function($query) { $query->where('tel', $this->tel[$this->j]) ->where('user_id', '!=', $this->user_id); }) ->orWhere(function($query) { $query->where('email', $this->email[$this->j]) ->where('user_id', '!=', $this->user_id); })->exists() ;
select exists( select * from `issuers` where ( `tel` = '230-0234-5432' and `user_id` != 4604 ) or ( `email` = 'izumo@reqw.wer' and `user_id` != 4604) ) as `exists`