Include symbolic link results in error

[webinfo123]

I upgraded PHP today and noticed some new behaviour.

 

In the past I used include($_SERVER['DOCUMENT_ROOT'] ."/../phplib/config.inc.php"); to include some files. This worked fine, even if the $_SERVER['DOCUMENT_ROOT'] was a symlink. This way I could create different subdomains each in it's own directory. I could include the same config-file for each subdomain. I upgraded from php 5.2.11 to 5.3.2 and suddenly this is not working anymore.

 

When $_SERVER['DOCUMENT_ROOT'] is a symbolic link, the error "Unable to access /home/homedir/site_v3.0/subdomain/../phplib/functions.inc.php in ..." appears. The file "/home/homedir/site_v3.0/subdomain/../phplib/functions.inc.php" does exists and is accessible from the command line. When subdomain is not a symbolic link, there is no php error.

 

I searched the net, but I cannot find a solution to include a file over a symbolic link. Is there a solution is missed?