PHP返回Json数据函数封装

1/**
2 * 返回Json数据
3 * @param int $code
4 * @param string $message
5 * @param array $data
6 * @return string
7 */
8public function retJson($code,$message = '',$data = array())
9{
10    if(!is_numeric($code))
11    {
12        return '';
13    }
14
15    $result=array(
16        'code' => $code,
17        'message' => $message;
18        'data' => $data
19    );
20
21    echo json_encode($result);
22    exit;
23}