src/Request.php
public static function fromConsumerAndToken(
        Consumer $consumer,
        Token $token = null,
        $httpMethod,
        $httpUrl,
        array $parameters = [],
        $json = false
    ) {
        $defaults = [
            "oauth_version" => Request::$version,
            "oauth_nonce" => Request::generateNonce(),
            "oauth_timestamp" => time(),
            "oauth_consumer_key" => $consumer->key
        ];
        if (null !== $token) {
            $defaults['oauth_token'] = $token->key;
        }

        // The json payload is not included in the signature on json requests,
        // therefore it shouldn't be included in the parameters array.
        if ($json) {
            $parameters = $defaults;
        } else {
            $parameters = array_merge($defaults, $parameters);
        }

        return new Request($httpMethod, $httpUrl, $parameters);
    }
public static function fromConsumerAndToken(
        Consumer $consumer,
        Token $token = null,
        $httpMethod,
        $httpUrl,
        array $parameters = [],
        $json = false
    ) {
        $defaults = [
            "oauth_version" => Request::$version,
            "oauth_nonce" => Request::generateNonce(),
            "oauth_timestamp" => time(),
            "oauth_consumer_key" => $consumer->key
        ];
        if (null !== $token) {
            $defaults['oauth_token'] = $token->key;
        }

        // The json payload is not included in the signature on json requests,
        // therefore it shouldn't be included in the parameters array.
        if ($json) {
            $parameters = $defaults;
        } else {
            $parameters = array_merge($defaults, $parameters);
        }

        return new Request($httpMethod, $httpUrl, $parameters);
    }
pretty much a helper function to set up the request

@param Consumer $consumer
@param Token    $token
@param string   $httpMethod
@param string   $httpUrl
@param array    $parameters

@return Request