Description:
------------
The file_exists() function returns false on files that do exist but use a directory traversal in the path. Not at the start of the path, I mean in the middle of the path. (This type of path works fine on the include function)

Works fine on windows apache2.2.11 php5.2.9



Reproduce code:
---------------
(Example based on a file called 'real_file.php' being placed in a directory called 'real_dir')

$test_path = 'real_dir/fake_dir/../real_file.php',

if (file_exists($test_path)) {
    echo 'File does exist<br />';
    echo (@include($test_path)) ? 'File included' : 'File NOT included';
} else {
    echo 'File does Not exist<br />';
    echo (@include($test_path)) ? 'File included' : 'File NOT included';
}

Expected result:
----------------
File does exist
File included

Actual result:
--------------
File does NOT exist
File included