使用Steam API时出现Foreach PHP错误

Question

使用以下代码我收到错误“为foreach（）提供的无效参数”     

$apifr = "http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=".$steamkey."&steamids=".$id_banuser."&avatar";

$ch = curl_init();

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_URL,$apifr);

$result=curl_exec($ch);

$result = json_decode($result);
$result = $result->response->players;

foreach($result as $r){
    echo $r->avatarfull;
}
curl_close($ch);

接受所有建议：）