/**
  * One time exchange of username and password for access token and secret.
  *
  * @returns array("oauth_token" => "the-access-token",
  *                "oauth_token_secret" => "the-access-secret",
  *                "user_id" => "9436992",
  *                "screen_name" => "abraham",
  *                "x_auth_expires" => "0")
  */
 function getXAuthToken($username, $password)
 {
     $parameters = array();
     $parameters['x_auth_username'] = $username;
     $parameters['x_auth_password'] = $password;
     $parameters['x_auth_mode'] = 'client_auth';
     $request = $this->oAuthRequest($this->accessTokenURL(), 'POST', $parameters);
     $token = OAuthUtilFTS::parse_parameters($request);
     $this->token = new OAuthConsumerFTS($token['oauth_token'], $token['oauth_token_secret']);
     return $token;
 }
 public static function build_http_query($params)
 {
     if (!$params) {
         return '';
     }
     // Urlencode both keys and values
     $keys = OAuthUtilFTS::urlencode_rfc3986(array_keys($params));
     $values = OAuthUtilFTS::urlencode_rfc3986(array_values($params));
     $params = array_combine($keys, $values);
     // Parameters are sorted by name, using lexicographical byte value ordering.
     // Ref: Spec: 9.1.1 (1)
     uksort($params, 'strcmp');
     $pairs = array();
     foreach ($params as $parameter => $value) {
         if (is_array($value)) {
             // If two or more parameters share the same name, they are sorted by their value
             // Ref: Spec: 9.1.1 (1)
             natsort($value);
             foreach ($value as $duplicate_value) {
                 $pairs[] = $parameter . '=' . $duplicate_value;
             }
         } else {
             $pairs[] = $parameter . '=' . $value;
         }
     }
     // For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
     // Each name-value pair is separated by an '&' character (ASCII code 38)
     return implode('&', $pairs);
 }