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Re: Zip Code Proximity search
Posted by: Morgan Tocker
Date: October 09, 2007 09:28AM

As well as Yahoo, the Google API is also very good. It's quite easy to convert any address fragment into a latitude and longitude in PHP as follows:

<?php

$file = file_get_contents("http://maps.google.com/maps/geo?output=xml&q=";.
urlencode($address). "&key=".GOOGLE_MAP_KEY);

/**
* A Bug? It says it's utf-8, but it's really not :(
*/

$xml = iconv("ISO-8859-1", "UTF-8", $file);
$xml = simplexml_load_string($xml);

if (!is_object($xml))
throw new Exception("Could not connect to geocode server. Sent argument: $address");

if ($xml->Response->Status->code == 200) {

$coordinates = (string) $xml->Response->Placemark->Point->coordinates;
list($latitude, $longitude) = explode(',', $coordinates);

} else {
throw new Exception("could not find $address");
}

?>

Note: The code is a partial extract from Crash At Mine: http://www.crashatmine.org/snapshots/ (see lib/common_functions.php)

- Morgan

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