当app最小化后，可以在通知栏弹出，ios8貌似不支持，这是iso9下测试过的

private function send_msg($deviceToken, $message) {
// ??????????deviceToken???????????????
       //$deviceToken = '你自己从苹果上获得的token';

// Put your private key's passphrase here:
       $passphrase = '私钥;

// Put your alert message here:
      // $message = 'hr test';
       $pem=str_replace('\\',DIRECTORY_SEPARATOR,dirname(__FILE__).'\您的key.pem');


////////////////////////////////////////////////////////////////////////////////

       $ctx = stream_context_create();
       stream_context_set_option($ctx, 'ssl', 'local_cert', $pem);
       stream_context_set_option($ctx, 'ssl', 'passphrase', $passphrase);

//?????????????appstore??????
       $fp = stream_socket_client(
           'ssl://gateway.sandbox.push.apple.com:2195', $err,
           $errstr, 60, STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT, $ctx);

       if (!$fp)
           exit("Failed to connect: $err $errstr" . PHP_EOL);

       echo 'Connected to APNS' . PHP_EOL;

// Create the payload body
       $body['aps'] = array(
           'alert' => $message,
           'sound' => 'default'
       );

// Encode the payload as JSON
       $payload = json_encode($body);

// Build the binary notification
       $msg = chr(0) . pack('n', 32) . pack('H*', $deviceToken) . pack('n', strlen($payload)) . $payload;

// Send it to the server
       $result = fwrite($fp, $msg, strlen($msg));

       if (!$result)
           echo 'Message not delivered' . PHP_EOL;
       else
           echo 'Message successfully delivered' . PHP_EOL;

// Close the connection to the server
       fclose($fp);
   }