Codeigniter无法运行循环

Question

My model returns array with "user ids" and I want to run loop for each of those user ids but I get errors "Undefined variable: users" and "Invalid argument supplied for foreach()". Could you please check what is wrong with my controller code.

My Model:

 public function get_user_id($post_id){

    $this->db->select('user_id');
    $this->db->from('comments');   
    $this->db->where('post_id', $post_id);

    $query = $this->db->get();

if ($query && $query->num_rows() >= 1){ 

return $query->result();
    }    
     else {
    return false;
    }

   }

My controller:

$this->model_a->get_user_id($post_id);
$data["users"] = $this->model_a->get_user_id($post_id);         

foreach($users as $user){

$user_id = $user['user_id'];
//loop code 
}

Answer 1

Try

$data["users"] = $this->model_a->get_user_id($post_id);

foreach($data["users"] as $user){

$user_id = $user['user_id']; //loop code

}

There is no variable called $users