google maps - List nearest Longitude/Latitude from array -

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i have 2 variables define static longitude , latitude. want able define multi dimensional array holds following: id, longitude , latitude.

what want achieve - static longitude feed through loop of arrays , if finds within radius of 50 miles (or whatever), selects potential ones , lists them.

i not sure formula or algorithm can use check radius , bring nearest values.

please note: not using databases in example.

so far:

$mainlong = 57.7394571; $mainlat = -4.386997;  $main = array(         array("loc_1",57.7394571,-4.686997),         array("loc_2",51.5286416,-0.1015987),         array("loc_3",51.2715146,-0.3953564),         array("loc_4",50.837418,-0.1061897) );  foreach ( $main $key => $value ) {      if($value[1] == $mainlong){       print_r($value);     }  }

haversine formula help. here sample algorithm. can try out.

%% begin calculation  r = 6371;                                   % earth's radius in km delta_lat = locs{2}(1) - locs{1}(1);        % difference in latitude delta_lon = locs{2}(2) - locs{1}(2);        % difference in longitude = sin(delta_lat/2)^2 + cos(locs{1}(1)) * cos(locs{2}(1)) * ...     sin(delta_lon/2)^2; c = 2 * atan2(sqrt(a), sqrt(1-a)); km = r * c;                                 % distance in km   %% convert result nautical miles , miles  nmi = km * 0.539956803;                     % nautical miles mi = km * 0.621371192;                      % miles

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