I have the following PHP code:

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,$URL);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
        $result = curl_exec($ch);
        curl_close($ch);
        $obj = json_decode($result);

        foreach ($obj[0]->trends as $trend) echo utf8_decode($trend->name);

which works fine for URL #1 (into the variable $URL):

http://api.twitter.com/1/trends/1.json?exclude=hashtags

but causes an error "Cannot use object of type stdClass as array" for URL #2: http://api.twitter.com/1/trends/weekly.json?exclude=hashtags

I have searched for a while, but can't figure out a code to fix this and handle both URLs.

Any help would be much appreciated.