Instaphp/Instagram/Users.php
protected function SetRelationship($user_id, $action)
    {
        $this->AddParam('action', $action);
        return $this->Post($this->buildUrl($user_id . '/relationship'));
    }
protected function SetRelationship($user_id, $action)
    {
        $this->AddParam('action', $action);
        return $this->Post($this->buildUrl($user_id . '/relationship'));
    }
Sets a relationship between a particular user and the currently authenticated user
@access public
@param int $user_id A user ID
@param Array $token An associative array of key/value pairs to pass to the API
@return Response