OAuth2\OAuth2::getBearerTokenFromFormEncodedBody PHP Method

    protected function getBearerTokenFromFormEncodedBody(Request $request, $removeFromRequest)
    {
        if (false === $request->server->has('CONTENT_TYPE')) {
            return null;
        }
        $contentType = $request->server->get('CONTENT_TYPE');
        if (!preg_match('/^application\\/x-www-form-urlencoded([\\s|;].*)?$/', $contentType)) {
            return null;
        }
        if ('GET' === $request->getMethod()) {
            return null;
        }
        // S2 request only decodes form encoded parameters for PUT, DELETE, PATCH. Because we are not so picky, we can't use Request::$request parameter bag...
        $body = $request->getContent();
        parse_str($body, $parameters);
        if (false === is_array($parameters)) {
            return null;
        }
        if (false === array_key_exists(self::TOKEN_PARAM_NAME, $parameters)) {
            return null;
        }
        $token = $parameters[self::TOKEN_PARAM_NAME];
        if ($removeFromRequest) {
            // S2 request content is immutable, so we can't do nothing more than crippled implementation below...
            if (true === $request->request->has(self::TOKEN_PARAM_NAME)) {
                $request->request->remove(self::TOKEN_PARAM_NAME);
            }
        }
        return $token;
    }