I've standardized my PHP programming to use the environment variable
SCRIPT_NAME when I want my script to refer to itself in links and
form actions. I've known that PHP_SELF has the same information, but
I was more familiar with the name 'SCRIPT_NAME' from using it in perl, and
liked the feel of it more as it seems to describe the resource better
('PHP_SELF' could stand for the path to the PHP executable if I were to go
by the name only).
However, I just noticed a post on the php.general newsgroup where somebody
asked what the difference was between them. Semantically, there isn't any;
they should contain the same information. However, historically and
technically speaking, there is. SCRIPT_NAME is defined in the CGI 1.1
specification, and is thus a standard. However, not all web servers
actually implement it, and thus it isn't necessarily portable.
PHP_SELF, on the other hand, is implemented directly by PHP, and as
long as you're programming in PHP, will always be present.
Guess I have some grep and sed in my future as I change a bunch of
scripts...
