Description:
------------
on my windows system the function file_exists() returns true whenever the full qualified file path has more than a total of 259 characters.

if the path is relative, the cwd will be prepended and counted (e.g. 260-28=232).

i testet it with the snapshot of today (26-Jun-2006 16:19) as well. plain php.exe, no changes to modules or php.ini. same result.

i use an immaginary filename in the root of 'C:\'. the file obviously does not exist.

refer to http://bugs.php.net/bug.php?id=31347 describing the similar error with strlen > 255.


Reproduce code:
---------------
<?php
echo php_uname();

if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
   echo "Running on Windows with PHP ", phpversion(), "\n";
   $root = "c:".DIRECTORY_SEPARATOR;
} else {
   die("problem could not be reproduced on linux (debian with PHP 5.1.2-1+b1)\n");
}
$max = 260;

$t = $root.str_repeat('x', $max - strlen($root));
var_dump(strlen($t));
var_dump(file_exists($t));

$t = $root.str_repeat('x', $max - strlen($root) - 1);
var_dump(strlen($t));
var_dump(file_exists($t));

echo "\nif no root is given, then cwd is prepended:\n";
var_dump(getcwd().DIRECTORY_SEPARATOR);
var_dump(strlen(getcwd().DIRECTORY_SEPARATOR));
echo "\n";

$t = str_repeat('x', $max - strlen(getcwd().DIRECTORY_SEPARATOR));
var_dump(strlen($t));
var_dump(file_exists($t));

$t = str_repeat('x', $max - strlen(getcwd().DIRECTORY_SEPARATOR) - 1);
var_dump(strlen($t));
var_dump(file_exists($t));


Expected result:
----------------
Windows NT MWXDEV 5.1 build 2600
Running on Windows with PHP 5.1.4
int(260)
bool(false)
int(259)
bool(false)

if no root is given, then cwd is prepended:
string(28) "P:\Programming\xampp\htdocs\"
int(28)

int(232)
bool(false)
int(231)
bool(false)


an exception/warning would also be acceptable. but in case of doubt the function should return false.


Actual result:
--------------
Windows NT MWXDEV 5.1 build 2600
Running on Windows with PHP 5.1.4
int(260)
bool(true)
int(259)
bool(false)

if no root is given, then cwd is prepended:
string(28) "P:\Programming\xampp\htdocs\"
int(28)

int(232)
bool(true)
int(231)
bool(false)