How to get Distance in KM in this query

Question

$salons = Salon::select(\'salons.*\')
    ->selectRaw(\'( 6371* acos( cos( radians(?) ) *
                   cos( radians( lat ) )
                   * cos( radians(          


        

Answer 1

for obtaining the km you should use 111.045 km per degree (as an approximation)

   ( 111.045 * acos( cos( radians(?) ) *
                       cos( radians( lat ) )
                       * cos( radians( lng ) - radians(?)
                       ) + sin( radians(?) ) *
                       sin( radians( lat ) ) )
                     )