PHP

$_SERVER['QUERY_STRING']

The $_SERVER['QUERY_STRING'] variable gives you the entire query string of the url ie. all after the ? in the url.

Use as follows:

For http://www.somesite.com/?ref=123&bus=abc

echo $_SERVER['QUERY_STRING'];

will return:

ref=123&bus=abc

See also:

$_SERVER['HTTP_REFERER']

$_SERVER['HTTP_USER_AGENT']

$_SERVER['REMOTE_ADDR']

$_SERVER['PHP_SELF']

$_SERVER['REQUEST_URI']

$_SERVER['DOCUMENT_ROOT']

$_SERVER['HTTP_HOST']

$_SERVER['SCRIPT_FILENAME']