Object of class stdClass could not be converted to string

I am having a problem with PHP at the moment, I am getting this error,

Object of class stdClass could not be converted to string the error occurs when I run this portion of code in my site,

function myaccount() {
    $data['user_data'] = $this->auth->get_userdata($this->uri->segment(3));
    //var_dump($data['user_data']);
    $this->load->model('users_model');
    $data['user_info'] = $this->users_model->get_user_and_roadmaps_by_id($this->uri->segment(3));
    $this->template->build('users/my_account', $data);
}

The line in which the error is occuring is this one,

$data['user_data'] = $this->auth->get_userdata($this->uri->segment(3));

And this line is calling this function,

   function get_userdata() {

        $CI =& get_instance();

        if(!$this->logged_in()) {
            return false;
        } else {
            $query = $CI->db->get_where('users', array('user_id' => $CI->session->userdata('user_id')));
            return $query->row();
        }
    }

I don’t really now what this problem is, so any help would be great.

Answer

Most likely, the userdata() function is returning an object, not a string. Look into the documentation (or var_dump the return value) to find out which value you need to use.

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Answer