Geocoding a specific address fails from PHP, works from browser using the same URL

Question

I'm using this code snippet to geocode an address using Google Geolocation API:

<?php
$address = "Frazione Levà - 16030 Sori (GE)";
$url = 'http://maps.google.com/maps/api/geocode/xml?address='.urlencode($address).'&sensor=false';
echo $url."\n";
$xml = file_get_contents($url);
var_dump($xml);
?>

The echo command shows the URL called is:

http://maps.google.com/maps/api/geocode/xml?address=Frazione+Lev%C3%A0+-+16030+Sori+%28GE%29&sensor=false

and the var_dump command shows the result is:

string(107) "<?xml version="1.0" encoding="UTF-8"?>
<GeocodeResponse>
 <status>ZERO_RESULTS</status>
</GeocodeResponse>
"

So it seems the address cannot be geolocated.

If I call exactly the same URL above ( http://maps.google.com/maps/api/geocode/xml?address=Frazione+Lev%C3%A0+-+16030+Sori+%28GE%29&sensor=false) from my browser, I get a totally different result (the address is correctly geolocated):

<?xml version="1.0" encoding="UTF-8"?>
 <GeocodeResponse>
  <status>OK</status>
...

How this is possible and how I can fix it? I need to geolocate addresses from PHP.

Please note I'm using the same code snippet in a loop to geolocate hundreds of addresses every day, and it works fine on most of them; only on some addresses it shows issues like that.

In my browser, that URL returns the `ZERO_RESULTS` response. — elixenide, Jun 10 '15 at 06:23
@r3wt Already tried with rawurlencode, unfortunately does not work — Marco Marsala, Jun 10 '15 at 06:29
@EdCottrell in my IE, FF and Chrome I get an OK reply. How it is possible? See screenshot: http://snag.gy/K3vsl.jpg — Marco Marsala, Jun 10 '15 at 06:33
@EdCottrell tried that URL also from my cell phone 3G connection (another provider, another IP, ...) and I get an OK reply too — Marco Marsala, Jun 10 '15 at 06:38
@MarcoMarsala I'm not sure what to tell you. That is strange. — elixenide, Jun 10 '15 at 06:38

score 6 · Accepted Answer · edited May 23 '17 at 12:17

Found the solution here https://stackoverflow.com/a/10302440/2717254 thread found thanks to the StackOverflow related questions suggested in the sidebar :-)

Issue was the Region Biasing. I added ?region=it to the URL and results are now coherent.

Before adding that param, probably Google guessed it me when I loaded the page in the web browser because of headers sent by my browsers (in italian Language on Win7 italian). When I make the request from PHP, less headers are sent and probably Google thinks this is an en-US PC or something similar... :)

Also removing the ZIP code from the address also gives me coherent result across my PHP script and my web browser, but I think the ?region=it is the most clean and logically correct solution.

I found another strange case, using hyphens ' in address leads to different results across geolocation API and Google Maps. Solution was to remove hyphens from address, while accented letters aren't a problem if using urlencode. — Marco Marsala, Jun 10 '15 at 07:07

score 0 · Answer 2 · answered May 16 '19 at 19:20

0

In my case I solved it with language instead of region: language=it (https://developers.google.com/maps/faq#languagesupport)

answered May 16 '19 at 19:20

Carlos

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Geocoding a specific address fails from PHP, works from browser using the same URL

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