Description:
------------
Streams of type php://memory cannot be represented as selectable descriptors 
where stream_select() is concerned. Attempting to do so will (rightly) trigger an 
E_WARNING along the lines of "Warning: stream_select(): cannot represent a stream 
of type MEMORY as a select()able descriptor in ..."

I would expect streams of type php://temp to behave the same way. However, this 
is not the case. Instead, php://temp streams are immediately readable (but do not 
evaluate to TRUE for feof($stream). These streams should either (1) trigger an 
error similar to that of php://memory or (2) not be represented as readable by 
stream_select().

Test script:
---------------
$stream = fopen('php://memory', 'r+');
$r = array($stream);
$w = $e = NULL;

stream_select($r, $w, $e, 0); // E_WARNING (as expected)

$stream = fopen('php://temp', 'r');
$r = array($stream);
$w = $e = NULL;

if (stream_select($r, $w, $e, 0)) {
    var_dump(feof($stream)); // this isn't readable and should never be called but it results in bool(false)
}

Expected result:
----------------
The test script should trigger two warnings and neither stream should report as 
readable.

Actual result:
--------------
php://temp streams do not trigger an error when used with stream_select() and are 
immediately reported as readable.