Description:
------------
You'll get a open_basedir related warning, if you try to access a 
symlink in open_basedir, but which points to a non-existent file:

PHP Warning:  file_exists(): open_basedir restriction in effect. 
File(symlink-exists-not) is not within the allowed path(s): 
(/tmp/open_basedir-symlinks)



Reproduce code:
---------------
$ ls -l
.
..
open_basedir-warning-if-symlink-does-not-exist.php
symlink-exists -> .
symlink-exists-not -> foo

$ php -d open_basedir=`pwd` open_basedir-warning-if-symlink-does-not-exist.php

open_basedir-warning-if-symlink-does-not-exist.php:
---------------------------------------------------
<?php
var_dump( file_exists('symlink-exists') );
var_dump( file_exists('symlink-exists-not') );

var_dump( file_exists($_SERVER['argv'][0]) );
var_dump( file_exists('does-not-exist') );
?>
---------------------------------------------------


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


Actual result:
--------------
bool(true)
PHP Warning:  file_exists(): open_basedir restriction in effect. 
File(symlink-exists-not) is not within the allowed path(s): 
(/tmp/open_basedir-symlinks) 
in /tmp/open_basedir-symlinks/open_basedir-warning-if-symlink-does-not-exist.php 
on line 3
bool(false)
bool(true)
bool(false)