CODEWITHSUNDEEP
phpxmlgoogle-apigoogle-weather-api
Bharanikumar
Bharanikumar

Reputation: 25733

Problem on Google weather report calcuation

This is about the Google Weather Report XML.

What is the calculation Google is doing?

When I google with weather=London,UK keyword, it's showing something like this screen shot,

alt text http://img293.imageshack.us/img293/4746/weathergoogle.jpg

In my XML there is nothing like 26, 11, 26, 22 no

My XML look like below.

alt text

What is the calculation involved in the weather report?

How to get these into PHP variable?

Upvotes: 0

Views: 1902

Answers (4)

Gordon
Gordon

Reputation: 316989

There is no calculation. The XML you linked has these nodes:

<temp_f data="70"/>
<temp_c data="21"/>

and

<low data="11"/>
<high data="26"/>

The first two are the temperature in Celsius and Fahrenheit for the current weather and corresponds to the left hand part on the Google Seach page. High and Low is what the Google Search Page shows for the Forecast (Celsius only).

PHP provides a number of libraries for working with XML. The most prominent being DOM, XMLReader and SimpleXML. Have a look at the examples in the PHP Manual on how to use them. Stack Overflow also has numerous questions and answers regarding their usage.

EDIT after Update: Seems like Google gives you the high/low values in Fahrenheit depending on the language set in the browser requesting the feed. Either add the language param hl=[languagecode] to the URL to see if you can request this in Celsius or - if that's not possible - convert high/low by hand:

            from Fahrenheit               to Fahrenheit
Celsius     [°C] = ([°F] − 32) × 5⁄9      [°F] = [°C] × 9⁄5 + 32

Upvotes: 4

steddy_eddie
steddy_eddie

Reputation: 161

As AR explains, returning Celsius values really is as easy as passing the language code.

The Google weather API isn't officially documented, but I found these 2 links useful:

Upvotes: 0

Bharanikumar
Bharanikumar

Reputation: 25733

    <?php
        $xml = simplexml_load_file('http://www.google.com/ig/api?weather=London');
        $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");
    ?>
    <html>
    <head>
        <title>Google Weather API</title>
    </head>
    <body>
        <h1><?php print $information[0]->city['data']; ?></h1>
        <h2>Today's weather</h2>
        <div class="weather">
            <img src="<?php echo  'http://www.google.com' . $current[0]->icon['data']?>" alt="weather"?>
            <span class="condition">
            <?php echo round(conver_f_c($current[0]->temp_f['data'])); ?>&deg; C,
            <?php echo $current[0]->condition['data'] ?>
            </span>
        </div>
        <h2>Forecast</h2>
        <?php foreach ($forecast_list as $forecast) : ?>
            <div class="weather">
                <img src="<?php echo 'http://www.google.com' . $forecast->icon['data']?>" alt="weather"?>
                <div><?php echo $forecast->day_of_week['data']; ?></div>
                <span class="condition">
                    <?php echo round(conver_f_c($forecast->low['data'])); ?>&deg; C - <?php echo round(conver_f_c($forecast->high['data'])); ?>&deg; C,
                    <?php echo $forecast->condition['data'] ?>
                </span>
            </div>
        <?php endforeach ?>
    </body>
</html>

<?php
function conver_f_c($F){

    return  $C = ($F - 32) * 5/9;
}

This snippet fixed my problem, Google weather API with image, PHP.

Upvotes: 0

AR.
AR.

Reputation: 1955

Actually, it's as easy as adding &hl=en-GB to the end of URL http://www.google.com/ig/api?weather=London,UK&hl=en-GB should work. For other languages there are parsing problems (UTF-8 related), but for English to turn to Centigrade you just need to switch to GB locale (US is set by default).

Upvotes: 1

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