Tp6 interface returns three elements

app/common.php


// The correct value returns three elements 
public function correct($code, $msg, $data = [''])
{
    return json_encode(['code' => $code, 'msg' => $msg, 'data' => $data]);
}

// Error value return three elements 
public function error($code, $msg, $data = [''])
{
    return json_encode(['code' => $code, 'msg' => $msg, 'data' => $data]);
}