Our server (Netscape Enterprise 3.0) and PHP are set up to serve the index.php file if only a directory name is specified in a URL. When this facility is used, the $PHP_SELF variable contains the directory part doubled.  Eg, the URL http://www.aps.anl.gov/~anj/test/ results in $PHP_SELF = /~anj/test//~anj/test/index.php whereas the URL http://www.aps.anl.gov/~anj/test/index.php returns the correct string. The PATH_INFO variable is correct though, so I use that as a workaround although that may not be correct in all situations. The above URLs currently display the relevent variables and phpinfo().