Description:
------------
Would it be possible to provide access to socket error codes/messages without the 
need to import the underlying socket into php_sockets?

It is often desirable to access the error information when a socket operation 
fails, and currently this is only possible via socket_import_stream, and 
subsequent calls to socket_last_error/socket_strerror. This is only possible if 
php_sockets is available to the PHP installation, which is frequently not the 
case.

Test script:
---------------
<?php

  $socket = stream_socket_client('tcp://11.22.33.44:123');

  if (fwrite($socket, 'some data') === false) {
    $errCode = stream_socket_error($socket);
    echo 'Sending data failed: Socket error #'.$errCode;
  }


Expected result:
----------------
Sending data failed: Socket error #<error code>

Actual result:
--------------
Fatal error - stream_socket_error or an equivalent function does not exist