数据返回格式

# app 数据返回
function appReturn($type=0,$msg='',$data){
    header('Content-Type:application/json; charset=utf-8');
    $r_data['type']    = $type;   
    $r_data['message'] = $msg;
    $r_data['data']    = $data;
    exit(json_encode($r_data));
}