code = $code; if($code == 'ok'){ $this->data = $data_or_message; }else{ $this->message = $data_or_message; } } function __toString(){ if($this->code == 'ok'){ $s = $this->data === null? '' : json_encode($this->data); }else{ $s = $this->message; } return sprintf('%-13s %12s %s', $this->cmd, $this->code, $s); } function ok(){ return $this->code == 'ok'; } function not_found(){ return $this->code == 'not_found'; } }