他の結合でlaravel5の緯度と経度で取得

以下のコードは、希望する方法で結果を取得できます。インラインでのコード説明。

if($request->input("postcode")) 
{
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_URL, "http://api.postcodes.io/postcodes/" . $request->input('postcode'));
    $result = json_decode(curl_exec($curl));
    curl_close($curl);
    $postcode_lat = $result->result->latitude;
    $postcode_long = $result->result->longitude;   

    $query = DB::table('dogs');
    //Join statement responsible for retrieving dogs addresses based on latitude and longitude in address table.
    $query->join(DB::raw('(SELECT  dog_id, (
                              3959 * acos (
                              cos ( radians($postcode_lat) )
                              * cos( radians( lat ) )
                              * cos( radians( long ) - radians($postcode_long) )
                              + sin ( radians($postcode_lat) )
                              * sin( radians( lat ) )
                            )       
                    )AS distance from dog_addresses) as dog_addresses'), function ($join){
            $join->on('dogs.id', '=', 'dog_addresses.dog_id')

        }); 
    $query->leftJoin('dog_videos','dogs.id','=','dogs_videos.dog_id');
    $query->leftJoin('dogs_breeds','dogs.breed_id','=','dogs_breeds.id');
    if($request->input("breed") && $request->input("breed") != "" && $request->input("breed") != "any")
    {
        $breed = Dog_Breed::where("breed_name", $request->input("breed"))->first();
        $query->where('dogs.breed_id', $breed->id);
    }
    $results = $query->orderBy('dog_addresses.distance', 'ASC') //Ordering the results in ascending order by calculated distance 
                    ->limit(20) //Limiting the results to 20 . Can be changed or removed according to your needs
                    ->get(); //Retrieving the results
}