任何人都知道，如果像下面这样的异步连接失败，是否可以检索一些错误信息（如C中的getsockopt SO_ERROR）：我没有使用套接字扩展，因为流提供了一个ssl Package 器

<?php
$ctx = stream_context_create();
stream_context_set_params($ctx, array("notification" => "stream_notification_callback"));
$destination = "tcp://92.247.12.242:8081";
$socket = stream_socket_client($destination, $errno, $errstr,
                                         10, STREAM_CLIENT_CONNECT | STREAM_CLIENT_ASYNC_CONNECT, $ctx);a
// plain socket
var_dump($socket);
// no error as expected
var_dump($errno);
var_dump($errstr);

stream_set_blocking($socket, false);

/* Prepare the read array */
$read   = array($socket);
$write  = array($socket);
$except = NULL;
if (false === ($num_changed_streams = stream_select($read, $write, $except, 10))) {
    var_dump("select failed?");
    /* Error handling */
} elseif ($num_changed_streams > 0) {

    /* At least on one of the streams something interesting happened */
    var_dump("event");
    // read fails, so the connect fails but why?
    $result = stream_socket_recvfrom($socket, 1024);
    var_dump($result);
    // no error again
    var_dump($errno);
    var_dump($errstr);
    // nothing interesting
    var_dump(stream_get_meta_data($socket));
}
// wont get called
function stream_notification_callback($notification_code, $severity, $message, $message_code, $bytes_transferred, $bytes_max) {
    $args = func_get_args();
    var_dump($args);
}

thx