PHP v4 vs. PHP v5 behavior

[Jesse Santana <jsantana@xxxxxxxxx>]

Maybe someone can shed some light on
this problem for me.  Our current production server is a Solaris 9
machine running Apache 1.3.37 and PHP 4.4.2.  The following script
works perfectly on this machine:

<?php
include("./../extension.inc");

echo "<BR>";
echo "Hello World!";
?>

The new server we are setting up is
running Solaris 10, Apache 2.2.4 and PHP 5.2.3.  The same script I
mentioned above produces this error:

Warning: include(./../extension.inc) [function.include]:
failed to open stream: Permission denied in /home/bu/jsantana/htdocs/php/IncludeExample.php
on line 3

Warning: include() [function.include]:
Failed opening './../extension.inc' for inclusion (include_path='.:/usr/local/php5/lib/php')
in /home/bu/jsantana/htdocs/php/IncludeExample.php on line 3

Hello World! 

If I define my include path as include("/home/bu/jsantana/htdocs/extension.inc");,
the script works fine with PHP 5.  Can anyone explain why under PHP
5 the ./../ does not back up one directory from the directory where I call
my script from?

Thank you,

Jesse

Jesse Santana
Project Lead - Enterprise Services Group
Information Technology Services
California State University, Long Beach
1250 Bellflower Blvd.
Long Beach, CA  90840
Office: (562)985-8511
Fax:     (562)985-8855