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Geo Distance
Source
<?php
/**
* Fetches the distance between two given german country codes.
*
* This function will need a MySQL database with the OpenGeoDB data.
* You can get this under: http://opengeodb.hoppe-media.com/
*
* @author Denis Perrevoort <denis@perrevoort.com>
* @version 1.0.0
* @link http://perrevoort.com/en/repository/GeoDistance
* @param string $plz_1
* @param string $plz_2
* @return float $distance
*/
function fetchDistanceByPLZ($plz_1, $plz_2)
{
$database = 'geodb';
if(strlen($plz_1) != 5 || strlen($plz_2) != 5 || !is_numeric($plz_1) || !is_numeric($plz_2))
return -1; // At least one of both codes is invalid
elseif($plz_1 == $plz_2)
return 0; // Same country codes - distance is null
// Statement to query the Distance from the OpenGeoDB database
// 1.85201 is the conversion factor from nautical miles to kilometers
$sql = "
SELECT
DEGREES(
ACOS(
SIN(RADIANS(c1.lat)) * SIN(RADIANS(c2.lat))
+ COS(RADIANS(c1.lat)) * COS(RADIANS(c2.lat))
* COS(RADIANS(c1.lon - c2.lon))
) * 60 * 1.85201
) AS distance
FROM
{$database}.geodb_textdata t1,
{$database}.geodb_textdata t2,
{$database}.geodb_coordinates c1,
{$database}.geodb_coordinates c2
WHERE
t1.text_type = 500300000
AND t2.text_type = 500300000
AND t1.text_val = \"{$plz_1}\"
AND t2.text_val = \"{$plz_2}\"
AND c1.loc_id = t1.loc_id
AND c2.loc_id = t2.loc_id
";
$query = mysql_query($sql);
if($row = mysql_fetch_assoc($query))
{
// get the database result and round it
if($row['distance'] < 100)
// return distance (in km) round to one position after decimal point
return round($row['distance'], 1);
else
// round to no position after decimal point from 100km and more
return round($row['distance'], 0);
}
else
{
// No result found
return -1;
}
}
?>
Example
<?
require_once('function.fetchDistancebyPLZ.php');
$plz_1 = $_GET['plz_1']; // e.g. '60311' (Country code for Frankfurt)
$plz_2 = $_GET['plz_2']; // e.g. '95444' (Country code for Bayreuth)
$distance = fetchDistanceByPLZ($plz_1, $plz_2);
echo("Distance: {$distance} km");
?>
Output
Distance: 207.6 km