php - Getting data from Yelp API

I'm starting to look into Yelp API. When I send a search request I get a data returned in an array $response. So If I output it like this

echo '<pre>';
print_r($response);
echo '</pre>';
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I see results in the following format

stdClass Object
(
    [message] => stdClass Object
        (
            [text] => OK
            [code] => 0
            [version] => 1.1.1
        )

    [businesses] => Array
        (
            [0] => stdClass Object
                (
                    [rating_img_url] => http://s3-media2.ak.yelpcdn.com/assets/2/www/img/99493c12711e/ico/stars/v1/stars_4_half.png
                    [country_code] => US
                    ...
                 )
         )
)
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So, let's say I want to get the country code, shouldn't I be able to get it with something like?

echo $response['businesses'][0]->country_code;
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I'm not getting any results. What am I missing?