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Argument Result
PHP_SELF Returns the filename of the current script with the path relative to the root
SERVER_PROTOCOL Returns the name and revision of the page-requested protocol
REQUEST_METHOD Returns the request method used to access the page
REQUEST_TIME Returns the timestamp from the beginning of the request
DOCUMENT_ROOT Returns the root directory under which the current script is executing
HTTP_REFERER Returns the page address that referred to the current page
HTTP_USER_AGENT Returns the user agent of the header from the current request (handy for browser identification)
REMOTE_ADDR Returns the IP address of the current user (handy for security)
REMOTE_PORT Returns the port of the user's machine that is accessing the page
SCRIPT_FILENAME Returns the absolute filename from the current script
SCRIPT_NAME Returns the path of the current script
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