Add Twitter trending topics example

examples/twitter_trending_topics.php

@@ -0,0 +1,50 @@
+<?php
+require '../src/Curl/Curl.php';
+
+use \Curl\Curl;
+
+define('API_KEY', 'XXXXXXXXXXXXXXXXXXXXXXXXX');
+define('API_SECRET', 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
+define('OAUTH_ACCESS_TOKEN', 'XXXXXXXX-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
+define('OAUTH_TOKEN_SECRET', 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
+
+$woeid = '2487956';
+
+$oauth_data = array(
+    'id' => $woeid,
+    'oauth_consumer_key' => API_KEY,
+    'oauth_nonce' => md5(microtime() .  mt_rand()),
+    'oauth_signature_method' => 'HMAC-SHA1',
+    'oauth_timestamp' => time(),
+    'oauth_token' => OAUTH_ACCESS_TOKEN,
+    'oauth_version' => '1.0',
+);
+
+$request_values = $oauth_data;
+ksort($request_values);
+
+$url = 'https://api.twitter.com/1.1/trends/place.json';
+$request = implode('&', array(
+    'GET',
+    rawurlencode($url),
+    rawurlencode(http_build_query($request_values, '', '&', PHP_QUERY_RFC3986)),
+));
+$key = implode('&', array(rawurlencode(API_SECRET), rawurlencode(OAUTH_TOKEN_SECRET)));
+$oauth_data['oauth_signature'] = base64_encode(hash_hmac('sha1', $request, $key, true));
+
+$authorization = array();
+foreach ($oauth_data as $key => $value) {
+    $authorization[] = $key . '="' . rawurlencode($value) . '"';
+}
+$authorization = 'Authorization: OAuth ' . implode(', ', $authorization);
+
+$curl = new Curl();
+$curl->setOpt(CURLOPT_HTTPHEADER, array($authorization));
+$curl->get($url, array(
+    'id' => $woeid,
+));
+
+echo 'Current trends:' . "\n";
+foreach ($curl->response['0']->trends as $trend) {
+    echo '- ' . $trend->name . "\n";
+}