cgi.fix_pathinfo provides real PATH_INFO/PATH_TRANSLATED support for CGI. PHP's previous behavior was to set PATH_TRANSLATED to SCRIPT_FILENAME, and to not care what PATH_INFO is. For more information on PATH_INFO, see the cgi specifications. Setting this to 1 causes PHP CGI to fix its paths to conform to the specification.
However while ExtendedStatus is Off in Apache settings, this option doesn't work.