Description:
------------
Asynchronously connecting a TCP socket stream to a filtered port times out, but closing the resource using fclose() blocks for 0.5 second.

Asynchronously connecting a TCP socket stream to a closed port ends up with the server explicitly refusing the connection by a RST ACK packet. Using stream_select() returns the stream resource as having had an except but trying to close the resource using fclose() blocks for 0.5 second too.

No network transfer was captured by Wireshark apart from the initial SYN packet in either case. Using fclose() on a successfully asynchronously connected TCP socket stream to an open port returns instantaneously.

If you don't explicitly fclose() the resources of failed connections, the same 0.5 seconds lag appears at the end of the script execution for each one. PHP probably cleanly frees resources at shutdown, but it can reach several seconds when several sockets have failed.

When using non-blocking BSD socket with the sockets extension, no delay of any kind is noticed.

Reproduce code:
---------------
<?php

	// Send a [SYN] packet to scanme.nmap.org:70
	$time = microtime(true);
	$resource = stream_socket_client('tcp://'.gethostbyname('scanme.nmap.org').':70', $null = null, $null, 0, STREAM_CLIENT_ASYNC_CONNECT | STREAM_CLIENT_CONNECT);
	stream_set_blocking($resource, 0);
	echo 'Open	'.number_format((microtime(true) - $time), 6).PHP_EOL;

	// Wait 3 seconds for a [SYN, ACK] packet
	$time = microtime(true);
	$read = $write = $except = array($resource);
	stream_select($read, $write, $except, 3);
	echo 'Wait	'.number_format((microtime(true) - $time), 6).'	read '.count($read).', write '.count($write).', except '.count($except).PHP_EOL;

	// Cancel connection
	$time = microtime(true);
	fclose($resource);
	echo 'Close	'.number_format((microtime(true) - $time), 6).PHP_EOL;

?>

Expected result:
----------------
Open    0.010317
Wait    1.588449        read 0, write 0, except 1
Close   0.000099

Actual result:
--------------
Open    0.010002
Wait    1.547396        read 0, write 0, except 1
Close   0.510161