query string

hi all

i install and configure a solution provide by a bank to pay online with credit card.
the bank's server send some thing like

http://myserver/back.php?TPE=XXXXX&free-text=test&return-code=paiement

the variable TPE is  good with $TPE=XXXXX
but free-text contains the - sign which is illegal in a varialble
same thing with return-code
how to get $free-text and $return-code

idea ?

i have not the courage to make a script to use $GLOBALS[QUERY_STRING]
thank

Thierry