Description:
------------
closedir() will accept a file resource opened by fopen() as the $directory argument. In the documentation for closedir() it says the following: "The stream must have previously been opened by opendir()". It seems that the resource type is not being checked correctly. 
A directory opened with opendir() can also be passed to fclose() without an error message being generated.

Reproduce code:
---------------
<?php
var_dump($fp = fopen(__FILE__, 'r'));
closedir($fp);
var_dump($fp);

$directory = dirname(__FILE__) . '/test';
mkdir($directory);
var_dump($dh = opendir($directory));
var_dump(fclose($dh));
var_dump($dh);
?>

Expected result:
----------------
resource(5) of type (stream)

Warning: closedir(): supplied argument is not a valid Directory resource in ...
resource(5) of type (stream)
resource(6) of type (stream)

Warning: fclose(): supplied argument is not a valid stream resource in ...
bool(false)
resource(6) of type (stream)

Actual result:
--------------
resource(5) of type (stream)
resource(5) of type (Unknown)
resource(6) of type (stream)
bool(true)
resource(6) of type (stream)