php中内置的推送通知提供程序

一开始我从互联网下载了一个php代码用于苹果推送通知，当我直接将设备令牌值分配给变量时，它是有效的，但当我编辑这个php代码以从数据库MYSQL中获取设备令牌值时，它不起作用：

<?php
// Put your private key's passphrase here:
$passphrase = '123456';
// Put your alert message here:
$message = 'hi push message';
 ////////////////////////////////////////////////////////////////////////////////
$ctx = stream_context_create();
stream_context_set_option($ctx, 'ssl', 'local_cert', 'ck.pem');
stream_context_set_option($ctx, 'ssl', 'passphrase', $passphrase);
// Open a connection to the APNS server
$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</br>' . PHP_EOL;
// Create the payload body
$body['aps'] = array(
'alert' => $message,
'sound' => 'default'
);
// Encode the payload as JSON
$payload = json_encode($body);
////////////////////////////////////////////////////////////////////////
//make global array
$x = array();
function selectfromdb(){
    $con = mysql_connect("localhost","root","root");
    mysql_select_db("my_db", $con);
 mysql_query("set character_set_server='utf8'");
 mysql_query("set names 'utf8'");
 $result = mysql_query("SELECT idip FROM iphoneid");
$c = 0;
while($r = mysql_fetch_array($result))
{
$x[$c] = $r['idip'];
$c++;
}
}
///////////////////////////////////////////////////////////////////////
selectfromdb();
$i = 0;
while ($i < sizeof($x)){
// Build the binary notification
$msg = chr(0) . pack('n', 32) . pack('H*',$x[$i]) . pack('n', strlen($payload)) .$payload;
// Send it to the server
$result = fwrite($fp, $msg, strlen($msg));

if (!$result)
echo 'Message not delivered</br>' . PHP_EOL;
else
echo 'Message successfully delivered</br>' . PHP_EOL;
$i++;
}
echo 'end</br>';
// Close the connection to the server
fclose($fp);
?>

输出：已连接到APNS结束