Im sorry.. here is the accual script.// constants for setting the $units data memberdefine('_UNIT_MILES', 'm');define('_UNIT_KILOMETERS', 'k');// constants for passing $sort to get_zips_in_range()define('_ZIPS_SORT_BY_DISTANCE_ASC', 1);define('_ZIPS_SORT_BY_DISTANCE_DESC', 2);define('_ZIPS_SORT_BY_ZIP_ASC', 3);define('_ZIPS_SORT_BY_ZIP_DESC', 4);// constant for miles to kilometers conversiondefine('_M2KM_FACTOR', 1.609344);class zipcode_class { var $last_error = ""; // last error message set by this class var $last_time = 0; // last function execution time (debug info) var $units = _UNIT_MILES; // miles or kilometers var $decimals = 2; // decimal places for returned distance function get_distance($zip1, $zip2) { // returns the distance between to zip codes. If there is an error, the // function will return false and set the $last_error variable. $this->chronometer(); // start the clock if ($zip1 == $zip2) return 0; // same zip code means 0 miles between. :) // get details from database about each zip and exit if there is an error $details1 = $this->get_zip_point($zip1); $details2 = $this->get_zip_point($zip2); if ($details1 == false) { $this->last_error = "No details found for zip code: $zip1"; return false; } if ($details2 == false) { $this->last_error = "No details found for zip code: $zip2"; return false; } // calculate the distance between the two points based on the lattitude // and longitude pulled out of the database. $miles = $this->calculate_mileage($details1[0], $details2[0], $details1[1], $details2[1]); $this->last_time = $this->chronometer(); if ($this->units == _UNIT_KILOMETERS) return round($miles * _M2KM_FACTOR, $this->decimals); else return round($miles, $this->decimals); // must be miles } function get_zip_details($zip) { // This function pulls the details from the database for a // given zip code. $sql = "SELECT lat AS lattitude, lon AS longitude, city, county, state_prefix, state_name, area_code, time_zone FROM zip_code WHERE zip_code='$zip'"; $r = mysql_query($sql); if (!$r) { $this->last_error = mysql_error(); return false; } else { $row = mysql_fetch_array($r, MYSQL_ASSOC); mysql_free_result($r); return $row; } } function get_zip_point($zip) { // This function pulls just the lattitude and longitude from the // database for a given zip code. $sql = "SELECT lat, lon from zip_code WHERE zip_code='$zip'"; $r = mysql_query($sql); if (!$r) { $this->last_error = mysql_error(); return false; } else { $row = mysql_fetch_array($r); mysql_free_result($r); return $row; } } function calculate_mileage($lat1, $lat2, $lon1, $lon2) { // used internally, this function actually performs that calculation to // determine the mileage between 2 points defined by lattitude and // longitude coordinates. This calculation is based on the code found // at http://www.cryptnet.net/fsp/zipdy/ // Convert lattitude/longitude (degrees) to radians for calculations $lat1 = deg2rad($lat1); $lon1 = deg2rad($lon1); $lat2 = deg2rad($lat2); $lon2 = deg2rad($lon2); // Find the deltas $delta_lat = $lat2 - $lat1; $delta_lon = $lon2 - $lon1; // Find the Great Circle distance $temp = pow(sin($delta_lat/2.0),2) + cos($lat1) * cos($lat2) * pow(sin($delta_lon/2.0),2); $distance = 3956 * 2 * atan2(sqrt($temp),sqrt(1-$temp)); return $distance; } function get_zips_in_range($zip, $range, $sort=1, $include_base) { // returns an array of the zip codes within $range of $zip. Returns // an array with keys as zip codes and values as the distance from // the zipcode defined in $zip. $this->chronometer(); // start the clock $details = $this->get_zip_point($zip); // base zip details if ($details == false) return false; // This portion of the routine calculates the minimum and maximum lat and // long within a given range. This portion of the code was written // by Jeff Bearer (http://www.jeffbearer.com). This significanly decreases // the time it takes to execute a query. My demo took 3.2 seconds in // v1.0.0 and now executes in 0.4 seconds! Greate job Jeff! // Find Max - Min Lat / Long for Radius and zero point and query // only zips in that range. $lat_range = $range/69.172; $lon_range = abs($range/(cos($details[0]) * 69.172)); $min_lat = number_format($details[0] - $lat_range, "4", ".", ""); $max_lat = number_format($details[0] + $lat_range, "4", ".", ""); $min_lon = number_format($details[1] - $lon_range, "4", ".", ""); $max_lon = number_format($details[1] + $lon_range, "4", ".", ""); $return = array(); // declared here for scope $sql = "SELECT zip_code, lat, lon FROM zip_code "; if (!$include_base) $sql .= "WHERE zip_code <> '$zip' AND "; else $sql .= "WHERE "; $sql .= "lat BETWEEN '$min_lat' AND '$max_lat' AND lon BETWEEN '$min_lon' AND '$max_lon'"; $r = mysql_query($sql); if (!$r) { // sql error $this->last_error = mysql_error(); return false; } else { while ($row = mysql_fetch_row($r)) { // loop through all 40 some thousand zip codes and determine whether // or not it's within the specified range. $dist = $this->calculate_mileage($details[0],$row[1],$details[1],$row[2]); if ($this->units == _UNIT_KILOMETERS) $dist = $dist * _M2KM_FACTOR; if ($dist <= $range) { $return[str_pad($row[0], 5, "0", STR_PAD_LEFT)] = round($dist, $this->decimals); } } mysql_free_result($r); } // sort array switch($sort) { case _ZIPS_SORT_BY_DISTANCE_ASC: asort($return); break; case _ZIPS_SORT_BY_DISTANCE_DESC: arsort($return); break; case _ZIPS_SORT_BY_ZIP_ASC: ksort($return); break; case _ZIPS_SORT_BY_ZIP_DESC: krsort($return); break; } $this->last_time = $this->chronometer(); if (empty($return)) return false; return $return; } function chronometer() { // chronometer function taken from the php manual. This is used primarily // for debugging and anlyzing the functions while developing this class. $now = microtime(TRUE); // float, in _seconds_ $now = $now + time(); $malt = 1; $round = 7; if ($this->last_time > 0) { /* Stop the chronometer : return the amount of time since it was started, in ms with a precision of 3 decimal places, and reset the start time. We could factor the multiplication by 1000 (which converts seconds into milliseconds) to save memory, but considering that floats can reach e+308 but only carry 14 decimals, this is certainly more precise */ $retElapsed = round($now * $malt - $this->last_time * $malt, $round); $this->last_time = $now; return $retElapsed; } else { // Start the chronometer : save the starting time $this->last_time = $now; return 0; }}}
and here is a demo.php file for running the script<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Zip Code Range and Distance Calculation Demo</title> <style type="text/css" lang="en"> BODY, P { font-family: sans-serif; font-size: 9pt; } H3 { font-family: sans-serif; font-size: 14pt; } </style></head><body><?php/* DEMO for using the zipcode PHP class. By: Micah Carrick Questions? Comments? Suggestions? email@micahcarrick.com*/require_once('zipcode.class.php'); // zip code class// Open up a connection to the database. The sql required to create the MySQL// tables and populate them with the data is in the /sql subfolder. You can// upload those sql files using phpMyAdmin or a MySQL prompt. You will have to// modify the below information to your database information. mysql_connect('localhost','php_user','php_user') or die(mysql_error()); mysql_select_db('test') or die(mysql_error()); // Below is an example of how to calculate the distance between two zip codes.echo '<h3>A sample calculating the distance between 2 zip codes: 93001 and 60618</h3>';$z = new zipcode_class;$miles = $z->get_distance(97214, 98501);if ($miles === false) echo 'Error: '.$z->last_error;else echo "Zip code <b>97214</b> is <b>$miles</b> miles away from <b>98501</b>.<br />";// Below is an example of how to return an array with all the zip codes withing// a range of a given zip code along with how far away they are. The array's// keys are assigned to the zip code and their value is the distance from the// given zip code. echo '<h3>A sample getting all the zip codes withing a range: 2 miles from 97214</h3>';$zips = $z->get_zips_in_range('97214', 2, _ZIPS_SORT_BY_DISTANCE_ASC, true); if ($zips === false) echo 'Error: '.$z->last_error;else { foreach ($zips as $key => $value) { echo "Zip code <b>$key</b> is <b>$value</b> miles away from <b>97214</b>.<br />"; } // One thing you may want to do with this is create SQL from it. For example, // iterate through the array to create SQL that is something like: // WHERE zip_code IN ('93001 93002 93004') // and then use that condition in your query to find all pizza joints or // whatever you're using it for. Make sense? Hope so. echo "<br /><i>get_zips_in_range() executed in <b>".$z->last_time."</b> seconds.</i><br />";}// And one more example of using the class to simply get the information about// a zip code. You can then do whatever you want with it. The array returned// from the function has the database field names as the keys. I just do a // couple string converstions to make them more readable.echo '<h3>A sample getting details about a zip code: 97214</h3>';$details = $z->get_zip_details('97214');if ($details === false) echo 'Error: '.$z->last_error;else { foreach ($details as $key => $value) { $key = str_replace('_',' ',$key); $key = ucwords($key); echo "$key: $value<br />"; } }?>
from the looks of it, it gives you various things you can do, Im only interested in finding zipcodes (or my members with zipcodes) that are within a given radius of a given zipcode.