Save latitude and longitude after converted into string in Laravel

How can i convert properly the lat and long into string and save it to db mysql?Any help is much appreciated.

<?php namespace App\Http\Controllers;
        public function addLocation(Request $request){
            $address = NGO::all();
            $address->lat = $request['lat'];
            $address->lng = $request['lng'];
            $lat = $address->lat;
            $lng = $address->lng;
            $address = getaddress($lat,$lng);
            $address->save();

            return view('pages.Ngo.Add-New-Ngo-Scholar');
    }

    public function getaddress($lat,$lng)
    {
    $url = 'http://ift.tt/WJEHSa'.trim($lat).','.trim($lng).'&sensor=false';
    $json = @file_get_contents($url);
    $data=json_decode($json);
    $status = $data->status;
    if($status=="OK")
    return $data->results[0]->formatted_address;
    else
    return false;
    }

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