Article Diary - General Knowledge Digest

Geo-location Mapping With Google Maps API & PHP

Using a combination of a couple APIs, PHP and Curl you can easily incorporate Google Maps into your website that fairly accurately identify a visitor's location. Knowing a users location and further being able to map the location has many practical applications. I am going to breakdown the core elements of creating a map just like the one above. I plan on following up soon with more advanced Google Maps examples.
 
You will need the users' address to begin. If you run a site that collects that information during registration it can be used for mapping otherwise you can get the users city, state and country by grabbing their IP address and then calling one of the available geocoding APIs available.
 
Grab the users IP address.
$ip = $_SERVER['REMOTE_ADDR'];
 
Get the users City, State and Country.
$sturl = 'http://api.hostip.info/get_html.php?ip='.$ip;
$ch = curl_init($sturl);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_TIMEOUT,10);
$res = curl_exec($ch);
$resinfo = curl_getinfo($ch);
curl_close($ch);
preg_match('/City: ([a-zA-Z].+[a-zA-Z]+)/', $res, $r);
preg_match('/ (([A-Z][A-Z])/', $res, $s);
$city = $r[1];
$country = $s[1];
 
The above API at http://hostip.info can also return the latitude and longitude which is needed to map the location however for the purposes of this demo I am using the Google geo locator API. You will also need a Google Maps API key which can be requested from http://code.google.com/apis/maps/.
 
Call the Google API to get the latitude and longitude.
$key = "Your Google Maps API Key";
$address = urlencode($city.", ".$country);
$sturl = 'http://maps.google.com/maps/geo?q=' . $address . '&output=csv&key=' . $key;
$ch = curl_init($sturl);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_TIMEOUT,10);
$res = curl_exec($ch);
$resinfo = curl_getinfo($ch);
curl_close($ch);
$res = explode(",",$res);
$latitude = $res[2];
$longitude = $res[3];
 
Insert an image tag with the following SRC referencing Google's API.
http://maps.google.com/staticmap?key=' . $key . '&size=506x280&markers=' . $latitude . ',' . $longitude . '&zoom=3
 
This is just the tip of the iceberg. For more details on the API visit the Google documentation at http://code.google.com/apis/maps/documentation/.
 
Click here to download the PHP source code.
 
Attached Files
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Name
Email
Security Code Security Code
Related Articles RSS Feed
How can I change session timeout value?
Viewed 763 times since Tue, Apr 27, 2010
Flash Webcam Image Capture
Viewed 1122 times since Thu, Nov 12, 2009
Open Source Online Invoice System - siwapp
Viewed 1051 times since Thu, Jan 7, 2010
Best Free Web Icons for Different Purposes
Viewed 870 times since Mon, Dec 28, 2009
Create Full Screen Slideshows With Supersized
Viewed 791 times since Tue, Jan 5, 2010
How to password protect folder/files using htaccess file?
Viewed 756 times since Sun, Mar 14, 2010
jQuery Slider from a Select Element
Viewed 1987 times since Thu, Jan 14, 2010
jQuery Dropdown Check List
Viewed 1052 times since Thu, Jan 14, 2010
jqPlot - jQuery Charts & Plotting Plugin
Viewed 1063 times since Sat, Jan 9, 2010
MENU