google recaptcha没有在safari上工作

Question

I am trying to figure out why captcha never proves true on safari, sadly I dont have apple products and am dependent on a friend to test it for me. Before I start asking him to do more than submit forms, can anyone see an issue with this code that safari might not jive with but opera, iexplorer, firefox and chrome do??

if(isset($_POST['SubButton'])){     
    $url = 'https://www.google.com/recaptcha/api/siteverify';
    $privatekey = "******";
    $response = file_get_contents($url."?secret=".$privatekey."&response=".$_POST['g-recaptcha-response']."&remoteip=".$_SERVER['REMOTE_ADDR']);
    $data = json_decode($response);
    if(isset($data->success) && $data->success==true){