Description:
------------
If you open a program with proc_open and you connect both stdout and stderr of that program to a pty, the same pty is used. If you use select_stream on both stdout and stderr, select marks both as ready and you can not distinguish which one hash data as you can read from both resources.

Test script:
---------------
$descriptorspec = array(
	0 => array("pipe", "r"),
	1 => array("pty"),
	2 => array("pty"),
);

$proc = proc_open("programpath", $descriptorspec, $handles = array());

stream_select($read = array($handles[1], $handles[2]), $write = null, $urgent = null, $timeout = 10);

// $read now contains $handles[1] AND $handles[2], does not matter where the data was written to