PHP json_encode 生成对象，而不是数组

Question

I have the following PHP code which accesses DB functions, takes the response and encodes that to JSON.

Its supposed to make an error object and then an array containing all returned database rows.

$key = $db->getKeyPermissions();

    if ($key != false) {
        $response["error"] = FALSE;
    for($i = 0; $i < count($key); $i++){
        $response["key"] = array();    
        $response["key"]["endpoint_description"] = $key[$i]["endpoint_description"];
        $response["key"]["live"] = $key[$i]["live"];
        $response["key"]["activity_name"] = $key[$i]["activity_name"];

    }
    echo json_encode($response);

instead of echo'ing a list of around 13 items, it only echos the very last item as an object. What am I doing wrong? How can I turn "key" object into a list containing all keys.

This is the JSON output.

{
  "error": false,
  "key": {
    "endpoint_description": "Guilds' rosters, history, and MOTDs for all guilds you are a member of.",
    "live": 0,
    "activity_name": ""
  }
}

Im fairly sure this is how it's supposed to look like, how I need it.

{
  "error": false,
  "key": [
    {
      "endpoint_description": "Guilds' rosters, history, and MOTDs for all guilds you are a member of.",
      "live": 0,
      "activity_name": ""
    },
    {
      "endpoint_description": "Guilds' rosters, history, and MOTDs for all guilds you are a member of.",
      "live": 0,
      "activity_name": ""
    },
    {
      "endpoint_description": "Guilds' rosters, history, and MOTDs for all guilds you are a member of.",
      "live": 0,
      "activity_name": ""
    }
  ]
}

Answer 1

$key = $db->getKeyPermissions();

if ($key != false) {
    $response["error"] = FALSE;
for($i = 0; $i < count($key); $i++){
    $response["key"][$i] = array();    
    $response["key"][$i]["endpoint_description"] = $key[$i]["endpoint_description"];
    $response["key"][$i]["live"] = $key[$i]["live"];
    $response["key"][$i]["activity_name"] = $key[$i]["activity_name"];

}
echo json_encode($response);

This should work as expected [$i] was missing.As per your requirement usage can be like

$response["key"][$i]

Please check

Answer 2

$key = $db->getKeyPermissions();

if ($key != false) {
    $response["error"] = FALSE;
    $response["key"] = array();
for($i = 0; $i < count($key); $i++){
    $response["key"][] = [
       "endpoint_description" => $key[$i]["endpoint_description"],
       "live" => $key[$i]["live"],
       "activity_name" => $key[$i]["activity_name"]
    ];
}
echo json_encode($response);