Description:
------------
file_exists does not properly resolve symlinks before applying open_basedir on "include" scripts.

in my situation
/home is a symlink to /data/home

open_basedir is set to /home/ericmarq/
apache documentroot is set to /home/ericmarq/public_html

Server running cPanel, apache 1.3

This did not happen in php 4.4.2, only happened after upgrade to 5.1.2

Reproduce code:
---------------
-- test1.php --
<?php
include("test2.php");
?>

-- test2.php --
<?php
if (!file_exists("/home/ericmarq/public_html/SUBDIR/does.not.exist.html")){
print "no";
}
?>

Expected result:
----------------
no

Actual result:
--------------
Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/home/ericmarq/public_html/SUBDIR/does.not.exist.html) is not within the allowed path(s): (/home/ericmarq/) in /data/home/ericmarq/public_html/test2.php on line 2
no