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This bug still exists in PHP-5.2.11-dev (phpinfo(): System Windows NT, 5.2 build 3790, Build Date Aug 11 2009 11:42:34). Here some more detailled information.

is_readable and is_writable seem to ignore ACLs.

testcase:

The apache 2.0.63 service runs as user "apache". I created three files as follows:

- "not_readable.txt" without any permissions for user "apache"
- "readable.txt" with permissions "Read, Execute" and "Read"
- "writable.txt" with permissions "Change", "Read, Execute", "Read", "Write"

testcode:

echo 'not_readable.txt is ' . (is_writable('not_readable.txt') ? 'writable' : 'not writable') . '; ';
echo 'fopen("not_readable.txt", "a") returns ' . (@fopen("not_readable.txt", "a") ? 'true' : 'false'). '<br/>';
echo 'not_readable.txt is ' . (is_readable('not_readable.txt') ? 'readable' : 'not readable') . '; ';
echo 'fopen("not_readable.txt", "r") returns ' . (@fopen("not_readable.txt", "r") ? 'true' : 'false'). '<br/>';
echo 'readable.txt is ' . (is_writable('readable.txt') ? 'writable' : 'not writable') . '; ';
echo 'fopen("readable.txt", "a") returns ' . (@fopen("readable.txt", "a") ? 'true' : 'false'). '<br/>';
echo 'readable.txt is ' . (is_readable('readable.txt') ? 'readable' : 'not readable') . '; ';
echo 'fopen("readable.txt", "r") returns ' . (@fopen("readable.txt", "r") ? 'true' : 'false'). '<br/>';
echo 'writable.txt is ' . (is_writable('writable.txt') ? 'writable' : 'not writable') . '; ';
echo 'fopen("writable.txt", "a") returns ' . (@fopen("writable.txt", "a") ? 'true' : 'false'). '<br/>';
echo 'writable.txt is ' . (is_readable('writable.txt') ? 'readable' : 'not readable') . '; ';
echo 'fopen("writable.txt", "r") returns ' . (@fopen("writable.txt", "r") ? 'true' : 'false'). '<br/>';

actual result:

not_readable.txt is writable; fopen("not_readable.txt", "a") returns false
not_readable.txt is readable; fopen("not_readable.txt", "r") returns false
readable.txt is writable; fopen("readable.txt", "a") returns false
readable.txt is readable; fopen("readable.txt", "r") returns true
writable.txt is writable; fopen("writable.txt", "a") returns true
writable.txt is readable; fopen("writable.txt", "r") returns true

expected result:

not_readable.txt is not writable; fopen("not_readable.txt", "a") returns false
not_readable.txt is not readable; fopen("not_readable.txt", "r") returns false
readable.txt is not writable; fopen("readable.txt", "a") returns false
readable.txt is readable; fopen("readable.txt", "r") returns true
writable.txt is writable; fopen("writable.txt", "a") returns true
writable.txt is readable; fopen("writable.txt", "r") returns true

Please try using this snapshot:

  http://snaps.php.net/php5.3-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/

It does indeed work with php-5.3.1-dev. However, the production server is still running php-2.2 and can't be updated (yet).

We can't backport the ACL support to 5.2 (new feature).