php - MySQL Great Circle Distance (Haversine formula) -


i've got working php script gets longitude , latitude values , inputs them mysql query. i'd make solely mysql. here's current php code:

if ($distance != "any" && $customer_zip != "") { //get great circle distance      //get origin zip code info     $zip_sql = "select * zip_code zip_code = '$customer_zip'";     $result = mysql_query($zip_sql);     $row = mysql_fetch_array($result);     $origin_lat = $row['lat'];     $origin_lon = $row['lon'];      //get range     $lat_range = $distance/69.172;     $lon_range = abs($distance/(cos($details[0]) * 69.172));     $min_lat = number_format($origin_lat - $lat_range, "4", ".", "");     $max_lat = number_format($origin_lat + $lat_range, "4", ".", "");     $min_lon = number_format($origin_lon - $lon_range, "4", ".", "");     $max_lon = number_format($origin_lon + $lon_range, "4", ".", "");     $sql .= "lat between '$min_lat' , '$max_lat' , lon between '$min_lon' , '$max_lon' , ";     }

does know how make entirely mysql? i've browsed internet bit of literature on pretty confusing.

from google code faq - creating store locator php, mysql & google maps:

here's sql statement find closest 20 locations within radius of 25 miles 37, -122 coordinate. calculates distance based on latitude/longitude of row , target latitude/longitude, , asks rows distance value less 25, orders whole query distance, , limits 20 results. search kilometers instead of miles, replace 3959 6371. 

select id, ( 3959 * acos( cos( radians(37) ) * cos( radians( lat ) )  * cos( radians( lng ) - radians(-122) ) + sin( radians(37) ) * sin(radians(lat)) ) ) distance  markers  having distance < 25  order distance  limit 0 , 20;

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