$post_array = array( 'username' => 'username_name', 'email' => 'the email', 'password' => 'passtext', 'first_name' => 'name', 'last_name' => 'lname', 'phone' => '3692587', 'grupos' => Array ('2','3')); $this->ion_auth->update($primary_key, $post_array);