$user = json_decode(file_get_contents("https://api.vk.com/method/users.get?user_ids={$'users_id'}&name_case=acc&v=5.67"), true);
$users = '<a href="//vk.com/id'.$usersad['response'][0]['id'].'" target="_blank" >'.$usersad['response'][0]['first_name'].' '.$usersad['response'][0]['last_name'].'</a>';
for(i = 0; i == что-то.length; i++){
$users[i] = '<a href="//vk.com/id'.$usersad['response'][i]['id'].'" target="_blank" >'.$usersad['response'][i]['first_name'].' '.$usersad['response'][i]['last_name'].'</a>';
i++;
}