Dynamic open_basedir and mod_vhost_alias

Maybe anyone can point me in the right direction. I need to modify this patch http://www.phpbuilder.com/lists/php-developer-list/2000101/0994.php and replace VIRTUAL_DOCUMENT_ROOT with real path. As described in patch note - "When using mod_vhost_alias the DOCUMENT_ROOT = PATH_TRANSLATED - SCRIPT_NAME(request_uri)" But in fact this is not always true. If we used any redirection (mod_rewrite) for example, in the request_uri would be modified uri For example 1. Without any redirects url - http://project.domain.com/subdir1/test.php SG(request_info).path_translated=/var/www/vhosts/project/subdir1/test.php SG(request_info).request_uri=/subdir1/test.php Looks everything is ok. doc_root = strncpy( real_open_basedir_path, SG(request_info).path_translated, strlen(SG(request_info).path_translated) - strlen(SG(request_info).request_uri) ); 2. With some kind of redirects url - http://magento.domain.com/index.php SG(request_info).path_translated=/var/www/vhosts/magento/index.php SG(request_info).request_uri=/index.php/install And that is a BIG problem. So my question. Could we get in php, maybe through apache API original uri or doc_root? So latter we can replace VIRTUAL_DOCUMENT_ROOT in PG(open_basedir) with the real path?