PHP echo / mysql不能正确处理特殊字符

I have a JSON file, accessed remotely from a third-party website. It contains strings with special characters such as these:

"name":"StatTrak\u2122 FAMAS | Pulse", and "name":"\u2605 Butterfly Knife | Case Hardened",

However, when I echo these values using the following PHP code:

$url = "https://www.example.com";

$json = file_get_contents($url);
$obj = json_decode($json);

$descriptions = $obj->rgDescriptions;
foreach ($descriptions as $key => $value) {
    echo htmlspecialchars($value->name);
    echo htmlspecialchars($value->name, ENT_QUOTES, 'UTF-8');
}

It prints these lines as:

StatTrakâ„¢ FAMAS | Pulse and â˜… Butterfly Knife | Case Hardened

How can this be prevented? This also occurs when storing these values in a MySQL table.

I have also tried the following:

$enc = mb_detect_encoding($value->name, "UTF-8,ISO-8859-1");

echo (iconv($enc, "UTF-8", $value->name) . ",");

But the results are the same.

Set htmlspecialchars encoding to UTF-8.

echo htmlspecialchars($value->name, ENT_QUOTES, 'UTF-8');