Json数组，JSON对象和JSON字符串

Question

hello i have the following php script to fetch data from mysql database but i have a problem passing the json response

$data=[];

    while($row=mysqli_fetch_assoc($result))

    {
      array_push($data,[
                    'first_name' => $row['first_name'],
                    'last_name' => $row['last_name'],
                    ]);

    }

    echo json_encode($data);

and it produces the result

[{"first_name":"John","last_name":"Doe"}]
[{"first_name":"Doe","last_name":"John"}]

i would like it to produce

{
"users": [
    {
        "first_name": "John",
        "last_name": "Doe"
    },
    {
       "first_name": "Doe",
        "last_name": "John"
    }
    ]
}

I'm trying to get the json with retrofit using

@SerializedName("users")

Answer 1

I solved it simply by adding

echo json_encode(array("users"=>$data));

I guess trial an error actually helps us beginners when those with the knowledge to help us and save us time would rather down vote our questions. Wonder what they gain.