From what I recall this depends on what's thrown into it @ the SAPI handler level which you can view via source ...

http://lxr.php.net/source/php-src/sapi/
http://lxr.php.net/source/php-src/sapi/apache2handler/sapi_apache2.c
http://lxr.php.net/source/php-src/sapi/isapi/php5isapi.c

- Jon

On May 26, 2007, at 8:23 PM, David Krings wrote:

Hi!

Every web server generates a different $_SERVER array in PHP. I got burnt by it once. I used several keys/values that are present in the Luckasoft EnginServer, but not in Apache. I am sure that IIS again has a different $_SERVER and the whole picture may look different on Linux or Mac OS.

The question of the day is: Which keys/values are guaranteed to be present in $_SERVER on all/most of the modern servers?

David
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