if($member['lon'] && $member['lat']){
    //it_1 위도
    //it_2 경도 
    $select_location = " , 
    (
           6371 * acos ( cos ( radians({$member['lat']}) )
              * cos( radians( it_1 ) )
              * cos( radians( it_2) - radians({$member['lon']}) )
              + sin ( radians({$member['lat']}) ) * sin( radians( it_1 ) )
       )    
       ) AS distance " ;

} else $select_location = " ";