These functions are only available when running PHP as an Apache module.
As of PHP 4.3.2, PATH_TRANSLATED is no longer set
implicitly under the Apache 2 SAPI in contrast
to the situation in Apache 1, where it's set to the same value as
the SCRIPT_FILENAME server variable when it's not
populated by Apache. This change was made to comply with the
CGI specification that
PATH_TRANSLATED should only exist if
PATH_INFO is defined.
Apache 2 users may use AcceptPathInfo = On inside
httpd.conf to define PATH_INFO.