Description:
------------
There are often cases where apache users with php5 installed will want to use dynamic vhosts (not least because it's in the apache docs), which leads to something like this:

<VirtualHost 82.70.196.65:80>
    VirtualDocumentRoot /data/www/%0
    ServerName %0
    php_admin_value open_basedir %0
</VirtualHost>

Unfortunately apache is naughty and doesn't expand the %0 on the php_admin_value line, which means that restricting the directories that php has access to is a pain!

This I know is an apache problem, rather than a php one, however I found a patch on a forum (http://www.phpbuilder.com/lists/php-developer-list/2000101/0994.php) that gets around this nicely, and I just tweaked it to work in php5 (I'm not trying to claim any credit away from the original author, I just like the feature!).  I figured this was posted a long time ago, if he was going to submit it - he would have by now.

Basically it just adds a keyword of VIRTUAL_DOCUMENT_ROOT, which has essentially the same end result, as it causes the fopen wrapper to expand it to the VirtualDocumentRoot.

Patch included at the "Reproduce Code"

Reproduce code:
---------------
--- main/fopen_wrappers.c.orig  Sun Sep 25 22:25:20 2005
+++ main/fopen_wrappers.c       Sun Sep 25 22:28:40 2005
@@ -95,8 +95,18 @@
        char resolved_name[MAXPATHLEN];
        char resolved_basedir[MAXPATHLEN];
        char local_open_basedir[MAXPATHLEN];
+       char *local_open_basedir_sub; /* Substring pointer for strstr */
        int resolved_basedir_len;
        int resolved_name_len;
+
+       if ((strcmp(PG(open_basedir), "VIRTUAL_DOCUMENT_ROOT") == 0) &&
+               SG(request_info).path_translated && *SG(request_info).path_translated  ) {
+
+               strlcpy(local_open_basedir, SG(request_info).path_translated, sizeof(local_open_basedir));
+               local_open_basedir_sub=strstr(local_open_basedir,SG(request_info).request_uri);
+               /* Now insert null to break apart the string */
+               if (local_open_basedir_sub) *local_open_basedir_sub = '\0';
+       } else

        /* Special case basedir==".": Use script-directory */
        if (strcmp(basedir, ".") || !VCWD_GETCWD(local_open_basedir, MAXPATHLEN)) {