http://de.php.net/reserved.variables Quote:
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_SERVER["SCRIPT_NAME"] /phpinfo.php
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It's the path for the actual script.
'SCRIPT_NAME'
Contains the current script's path. This is useful for pages which
need to point to themselves. The __FILE__ constant contains the full
path and filename of the current (i.e. included) file.
Quote:
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_SERVER["PHP_SELF"] /phpinfo.php
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'PHP_SELF'
The filename of the currently executing script, relative to the
document root. For instance, $_SERVER['PHP_SELF'] in a script at the
address
http://example.com/test.php/foo.bar would be /test.php/
foo.bar. The __FILE__ constant contains the full path and filename of
the current (i.e. included) file.
If PHP is running as a command-line processor this variable
contains the script name since PHP 4.3.0. Previously it was not
available.
Variable Behavior 
