PHP question

[immortal20]

Whats the code in php to check to see what page I am on or a user is on. eXample: i want something to appear on one page but not another so i need to know what page the user is on so I can or cannot show it.
I know it has to do with $_Server but don't remember.

[PallaviDalvi]

$_server['php_self']....

[khp]

http://www.php.net/manual/en/reserved.variables.php#reserved.variables.server