无法在json_decode PHP中获取数据

Question

I have a script which Im trying to get values from a json string decoded into array.. i can not seem to access the data.

$userData = json_decode($_GET['userData']);

echo $_GET['userData']; //<--- This line works fine and show the $_GET value

$id = $userData['hottsourceID']; //<-- This line errors
$coins = $userData['coins'];

echo $id;
echo $coins;

Catchable fatal error: Object of class stdClass could not be converted to string in /home/hottsour/public_html/DeadRun/php/AppCreateDRAccount.php on line 11

Answer 1

By default json_decode will not create associative arrays, instead it will create objects

$data = json_decode('{"foo":"bar"}');

echo $data->foo;
// "bar"

If you'd like json_decode to use associative arrays instead, you can pass true as the second argument

$data = json_decode('{"foo":"bar"}', true);

echo $data["foo"];
// "bar"

---

Now that you know this, you can adapt your own solution like so

$userData = json_decode($_GET["userData"]);

$id = $userData->hottsourceID;
$coins = $userData->coins;

echo $id;
echo $coins;

---

Additional tips

Since you're parsing user input, you might want to throw an error if the JSON in $_GET["userData"] is invalid. json_decode will return null if parsing failed.

function decode($json) {
  $data = json_decode($json);
  if (is_null($data)) throw new Exception("Invalid JSON");
  return $data;
}

try {
  $userData = decode($_GET["userData"]);
  $id = $userData->hottsourceID;
  $coins = $userData->coins;

  echo $id;
  echo $coins;
}
catch (Exception $e) {
  echo $e->getMessage();
}