php - Google Weather API - parsing and modifying data -

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this question no longer up-to-date -- google shut down unofficial weather api in 2012

i'd put weather forecast friend's web page. when address for

http://www.google.com/ig/api?weather=koprivnica,croatia&hl=hr

the browser returns right content i'd parse php code:

<?php $xml = simplexml_load_file('http://www.google.com/ig/api?weather=koprivnica,croatia&hl=hr'); $information = $xml->xpath("/xml_api_reply/weather/forecast_information"); $current = $xml->xpath("/xml_api_reply/weather/current_conditions"); $forecast_list = $xml->xpath("/xml_api_reply/weather/forecast_conditions"); ?> <!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>vremenska prognoza</title> </head>     <body>         <h1><?= print $information[0]->city['data']; ?></h1>         <h2>danas</h2>         <div class="weather">             <img src="<?= 'http://www.google.com' . $current[0]->icon['data']?>" alt="weather"?>             <span class="condition">             <?= $current[0]->temp_f['data'] ?>&deg; f,             <?= $current[0]->condition['data'] ?>             </span>         </div>         <h2>prognoza</h2>         <?php foreach ($forecast_list $forecast) : ?>         <div class="weather">             <img src="<?= 'http://www.google.com' . $forecast->icon['data']?>" alt="weather"?>             <div><?= $forecast->day_of_week['data']; ?></div>             <span class="condition">                 <?= $forecast->low['data'] ?>&deg; f - <?= $forecast->high['data'] ?>&deg; f,                 <?= $forecast->condition['data'] ?>             </span>         </div>         <?php endforeach ?>     </body> </html>

but code above won't work because used 'hr' instead of 'en' (hr = croatian language):

$xml = simplexml_load_file('http://www.google.com/ig/api?weather=koprivnica,croatia&hl=en')

is working syntax returned data in english , temperature in fahrenheit.

i suppose it's matter of wrong utf-8 encoding property.

i not know how grab exact croatian text , convert degrees f celsius.

  1. i found afterwards link f-to-c solution , changed line 19:

    <?= $current[0]->temp_f['data'] ?>&deg; f,

    to

    <?= $current[0]->temp_c['data'] ?>&deg; c,

    (i not use in current version because seems api handles celsius.)

  2. to keep degrees in c while having language set "en" @ same time can use en-gb.

encoding problem:

for reason google returns xml content without proper encoding declaration. 1 expect like:

<?xml version='1.0' encoding='iso-8859-2'?>

but skip encoding attribute in header. makes simplexml_load_file function assume default encoding of utf-8. consider bug in api implementation, since xml spec defines utf-8 fallback default encoding.

to compesate this, try like:

<?php $url = "http://www.google.com/ig/api?weather=koprivnica,croatia&hl=hr"; $datainiso = file_get_contents($url); $datainutf = mb_convert_encoding($datainiso, "utf-8", "iso-8859-2"); $xml = simplexml_load_string($datainutf); ...

which seems work. iso-8859-2 value pure guess.

fahrenheit/celsius:

i don't see easy way request temperature data provided in celsius instead of fahrenheit in api (i couldn't find official doc, blind?). conversion f c shouldn't hard @ all.

try formula:

(°f  -  32)  x  5/9 = °c

which can find in thousand of places. took http://www.manuelsweb.com/temp.htm


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