codeigniter从模型返回false

Question

Just wondering if it is necessary to use else {return false;} in my codeigniter model functions or if () {} is enough and it returns false by default in case of failure?

controller:

if ($this->model_a->did()) {    
                $data["results"] = $this->model_a->did();
                echo json_encode($data);
            }

model:

public function did()
    {    
      //some code here    
        if ($query && $query->num_rows() > 0) {
            return $query->result_array();
        } else {
            return false;
        }    
    }

Answer 1

in your controller -- test the negative condition first - if nothing came back from the method in your model

if ( ! $data["results"] = $this->model_a->did() ) {    

    $this->showNoResults() ; }

else { echo json_encode($data); } 

so thats saying - if nothing came back - then go to the showNoResults() method. If results did come back then its assigned to $data

However - in this situation in the model i would also put ELSE return false - some people would say its extra code but for me it makes it clearer what is happening. Versus methods that always return some value.