Description:
------------
This is https://bugs.php.net/bug.php?id=44908 that is still exists... ~5 years :'(

> When using stream_select() on pipes returned by proc_open() in Windows, input streams that are not ready are returned in the modified $read array.

Test script:
---------------
<?php
// stream_select.php

$cmd         = "php stream_select.process.php";
$pipes       = array();
$descriptors = array(
    0 => array("pipe", "r"), // stdin
    1 => array("pipe", "w"), // stdout
    2 => array("pipe", "w"), // stderr
);
$process = proc_open($cmd, $descriptors, $pipes);

if (is_resource($process)) {
        $read    = [$pipes[1], $pipes[2]];
        $write   = null;
        $except  = null;
        $changed = stream_select($read, $write, $except, null);

        var_dump($changed, $read, $write);
}

// stream_select.process.php
<?php
fwrite(STDOUT, 'test');
fflush(STDOUT);
sleep(15);
exit(0);

Expected result:
----------------
int(1)
array(1) {
  [0]=>
  resource(5) of type (stream)
}
NULL

Actual result:
--------------
int(2)
array(2) {
  [0]=>
  resource(5) of type (stream)
  [1]=>
  resource(6) of type (stream)
}
NULL