php file_exists() return false on some directory on IIS

Environment:

1. php5
2. windows2003
3. IIS with fastCGI
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Code:

<?php
$p = "i:\\tmp";
if( file_exists($p) )
{
    print $p . ' exists!';
}
else
{
    print $p . ' not exists!';
}
?>

I get it:

when use

file_exist() 

to test an existing directory, if parent directory has no read permission of IUSR_MACHINE, the test always fails.

Make sure that directory is readable by checking it's permissions (chmod).

Alternatively, you might try using

is_readable()

function.

what does your code looks like? if you're testing with a string literal, don't forget that backslashes introduce escape sequences:

file_exists("D:\rip\this\nipple")

here \r is a carriage return, \t a tab, and \n a line feed.

If you are running PHP in safe mode then File_Exists will always return FALSE for files inaccessible due to safe mode restrictions.

Also note that the File_Exists caches it's result, so you might wan't to clear the cache with the ClearStatCache function