function generateRandomPoint($centre, $radius)
{
    $radius_earth = 3959; //miles

    //Pick random distance within $distance;
    $distance = lcg_value() * $radius;

    //Convert degrees to radians.
    $centre_rads = array_map('deg2rad', $centre);

    //First suppose our point is the north pole.
    //Find a random point $distance miles away
    $lat_rads = (pi() / 2) -  $distance / $radius_earth;
    $lng_rads = lcg_value() * 2 * pi();


    //($lat_rads,$lng_rads) is a point on the circle which is
    //$distance miles from the north pole. Convert to Cartesian
    $x1 = cos($lat_rads) * sin($lng_rads);
    $y1 = cos($lat_rads) * cos($lng_rads);
    $z1 = sin($lat_rads);


    //Rotate that sphere so that the north pole is now at $centre.

    //Rotate in x axis by $rot = (pi()/2) - $centre_rads[0];
    $rot = (pi() / 2) - $centre_rads[0];
    $x2 = $x1;
    $y2 = $y1 * cos($rot) + $z1 * sin($rot);
    $z2 = -$y1 * sin($rot) + $z1 * cos($rot);

    //Rotate in z axis by $rot = $centre_rads[1]
    $rot = $centre_rads[1];
    $x3 = $x2 * cos($rot) + $y2 * sin($rot);
    $y3 = -$x2 * sin($rot) + $y2 * cos($rot);
    $z3 = $z2;


    //Finally convert this point to polar co-ords
    $lng_rads = atan2($x3, $y3);
    $lat_rads = asin($z3);

    return array_map('rad2deg', array($lat_rads, $lng_rads));
}

for ($j = 0; $j < 12; $j++) {
        $data = [];

        for ($i = 0; $i < 10000; $i++) {
            $point = generateRandomPoint([37.3295584, -57.98016319], 16);
            $randDate = new DateTime();
            $randDate->setTime(mt_rand(0, 23), mt_rand(0, 59));

            $data[] = [
                'user_id' => rand(1, 2000),
                'location' => \DB::raw('ST_MakePoint(' . $point[0] . ',' . $point[1] . ')'),
                'timestamp' => $randDate->format('Y-m-d H:i:s'),
                'is_moving' => true,
                'activity_type' => 'walking',
                'accuracy' => 7.5,
            ];
        }
        \App\Location::insert(
            $data
        );
    }