Description:
------------
The results of is_readable() and is_writable() are being cached from the first result on a filesystem object regardless of whether or not clearstatcache() is used or in what form (arguments supplied, etc).  This has only been tested on the Windows build of PHP 5.3.3 via the CLI.  It's possible that other functions are being improperly cached as well, but I haven't had time to test for all of them as of yet.

This does *not*, however, occur in the corresponding Windows builds of PHP 5.3.2.  In that version, no caching took place on either of those functions at all.

You can easily reproduce this issue if you're running Windows ACL-related tests on the filesystem in PHP 5.3.3.  The sample script I put together requires the use of SetACL (better cross-Windows version portability; http://setacl.sourceforge.net) to alter the file permissions.  Relative to the test script, create a directory named "testdir", then touch a file within that directory and name it "testfile".  We will be using that file for our test.


This bug occurs on the ZIP-build of PHP 5.3.3 (both nts and zts) run via CLI without any extensions loaded.  It has been successfully reproduced in Windows XP, Windows 2003, Windows 2003 R2, Windows Vista/7, Windows 2008, and Windows 2008 R2.  Has not been tested on Linux.


Test script:
---------------
<?php

exec( "setacl.exe -on testdir -ot file -actn setprot -op \"dacl:p_nc;sacl:p_nc\" -rec cont_obj" );  //Isolate from any perms inherited from parent.
exec( "setacl.exe -on testdir -ot file -actn clear -clr DACL -rec cont_obj" );  //Clear any remaining perms.
exec( "setacl.exe -on testdir -ot file -actn ace -ace \"n:Everyone;m:grant;p:full\"" );  //Ensures that the parent dir perms won't affect the results.

exec( "setacl.exe -on testdir/testfile -ot file -actn ace -ace \"n:Everyone;m:deny;p:full\"" );

var_dump( is_readable( "testdir/testfile" ) );
var_dump( is_writable( "testdir/testfile" ) );

//Tried different variations of clearstatcache() by themselves and combined.  Made no difference either way.  Using sleep() after setacl call made no difference, either.
clearstatcache();
clearstatcache( TRUE, "testdir/testfile" );

exec( "setacl.exe -on testdir/testfile -ot file -actn clear -clr DACL" );
exec( "setacl.exe -on testdir/testfile -ot file -actn ace -ace \"n:Everyone;m:grant;p:full\"" );

/* Copy these two var_dumps into a separate PHP file and execute it immediately after this script....  You'll see the correct bool(true) results then.  
 * You can also achieve that result by calling that separate script from this one via an exec() call (but not as an include).  --Kris */
var_dump( is_readable( "testdir/testfile" ) );
var_dump( is_writable( "testdir/testfile" ) );


Expected result:
----------------
bool(false)
bool(false)
bool(true)
bool(true)


Actual result:
--------------
bool(false)
bool(false)
bool(false)
bool(false)