VARIABLE            MEANING

CONTENT_LENGTH      The length of POST data sent by the client.

CONTENT_TYPE        For POST and PUT requests, this is the type of data being sent.

PATH_INFO           extra path information 

PATH_TRANSLATED     Path info for Web document

QUERY_STRING        query string

REQUEST_METHOD      The type of request being made. Normally this is either GET or POST.

SCRIPT_NAME         The path to the script used to refer to it in a URL.