Sanitizing Filters *string*: Returns the input variable stripped of XML/HTML tags and other things that can cause XSS problems. *encoded*: Encodes all 'special' characters as URL encoded values. *special_chars*: Encodes all 'special' characters as XML entities. *unsafe_raw*: Returns the input variable as-is. *email*: Removes all characters that can not be part of a correctly formed e-mail address. *url*: Removes all characters that can not be part of a correctly formed URI. *number_int*: Removes everything [^0-9]. *number_float*: Removes everything [^0-9.]. *magic_quotes*: BC filter for people who like magic quotes.