Nearby stores in Laravel

i'm try to get neraby store in Laravel 5.1 I have geocoding parser that caluclate coorinate. But i have problem with haversine formulas. Basically i need that from table Aziende (Stores) given a lat, long e category passed trough url, fetch the nearby stores.

I try with this code:

$dove = Input::get('dove');
    $categoria_id = Input::get('id_categoria');
    // 4: check if any matches found in the database table 
    if (!empty($dove)) {
        $response = \GoogleMaps::load('geocoding')->setParamByKey ('address', $dove)->get();
        $response = json_decode($response, true);
        $latitude = $response['results'][0]['geometry']['location']['lat'];
        $longitude = $response['results'][0]['geometry']['location']['lng'];
        $radius = '5';
        $aziende  = DB::table('aziende')
            ->select(
                 ( 'lat * acos( cos( radians(50) ) * cos( radians( lat ) ) * cos( radians( lng ) - radians(-122) )
                       + sin( radians(37) ) * sin( radians( lat ) ) ) as distance') )->get();




    } else {
    $aziende = DB::table("aziende")->where('categoria', $categoria_id)->get();
 }
 ?>

via Chebli Mohamed