Get Tweets in PHP with OAUTH2

get-tweets-11.php

<?php

function buildBaseString($baseURI, $method, $params) {
	$r = array();
	ksort($params);
	foreach($params as $key=>$value){
		$r[] = "$key=" . rawurlencode($value);
	}
	return $method."&" . rawurlencode($baseURI) . '&' . rawurlencode(implode('&', $r));
}

function buildAuthorizationHeader($oauth) {
	$r = 'Authorization: OAuth ';
	$values = array();
	foreach($oauth as $key=>$value)
		$values[] = "$key=\"" . rawurlencode($value) . "\"";
	$r .= implode(', ', $values);
	return $r;
}

function getTweets($user) {
	try {

		$url = "https://api.twitter.com/1.1/statuses/user_timeline/".$user.".json";

		$oauth_access_token = "";
		$oauth_access_token_secret = "";
		$consumer_key = "";
		$consumer_secret = "";

		$oauth = array(
			'oauth_consumer_key' => $consumer_key,
			'oauth_nonce' => time(),
			'oauth_signature_method' => 'HMAC-SHA1',
			'oauth_token' => $oauth_access_token,
			'oauth_timestamp' => time(),
			'oauth_version' => '1.0'
			);

		$base_info = buildBaseString($url, 'GET', $oauth);
		$composite_key = rawurlencode($consumer_secret) . '&' . rawurlencode($oauth_access_token_secret);
		$oauth_signature = base64_encode(hash_hmac('sha1', $base_info, $composite_key, true));
		$oauth['oauth_signature'] = $oauth_signature;

		$header = array(buildAuthorizationHeader($oauth), 'Expect:');
		$options = array(
			CURLOPT_HTTPHEADER => $header,
			CURLOPT_HEADER => false,
			CURLOPT_URL => $url,
			CURLOPT_RETURNTRANSFER => true,
			CURLOPT_SSL_VERIFYPEER => false);

		$feed = curl_init();
		curl_setopt_array($feed, $options);
		$json = curl_exec($feed);
		curl_close($feed);

		$twitter_data = json_decode($json, true);
		if (isset($twitter_data['errors'])) return '';

		return $twitter_data;

	} catch (Exception $e) {
		return '';
	}
}