Description:
------------
In libevent extension version 0.1.0 it is impossible to use event_set with persistent socket resource. 

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

$socket = pfsockopen('php.net', 80);
stream_set_blocking($socket, 0);

$base = event_base_new();

$event = event_new();
$result = event_set($event, $socket, EV_READ | EV_WRITE, function ($socket) {

});

var_dump($result);


Expected result:
----------------
bool(true)

Actual result:
--------------
PHP Warning:  event_set(): fd argument must be either valid PHP stream or valid PHP socket resource