socket客户端的心跳数据处理问题

$in = '{"type":"test"}';
$out = '';

if(!socket_write($socket, $in, strlen($in))) {
    $errStr = "socket_write() failed: reason: " . socket_strerror($socket);
    echo http_text($FromUserName,$ToUserName,$errStr);exit;
}
$infoStr = '';
while($out = socket_read($socket, 8192)) {
    $infoStr = "接收服务器回传信息成功！\n";
    $infoStr .=  "接受的内容为:".$out;
}

echo http_text($FromUserName,$ToUserName,$infoStr);//回复微信消息

socket_close($socket);