src/Auth/SingleUserAuth.php
protected function getOauthString()
    {
        $oauth = array_merge($this->getOauthParameters(), array('oauth_signature' => $this->calculateSignature()));

        ksort($oauth);

        $values = array();

        foreach ($oauth as $key => $value) {
            $values[] = $key . '="' . rawurlencode($value) . '"';
        }

        $oauth = implode(', ', $values);

        unset($values, $key, $value);

        return $oauth;
    }
protected function getOauthString()
    {
        $oauth = array_merge($this->getOauthParameters(), array('oauth_signature' => $this->calculateSignature()));

        ksort($oauth);

        $values = array();

        foreach ($oauth as $key => $value) {
            $values[] = $key . '="' . rawurlencode($value) . '"';
        }

        $oauth = implode(', ', $values);

        unset($values, $key, $value);

        return $oauth;
    }
Converting OAuth parameters array to a single string with encoded values

@return string  Single string with encoded values